.Net: Move MEVD projects to separate solution

[westey-m]

Motivation and Context

• Remove MEVD projects from main SK solution, since they are not maintained in this repo anymore.

Description

• Move MEVD projects to separate solution
• Move memory samples to separate sample project

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[Copilot]

Pull request overview

This PR restructures the .NET solutions to separate MEVD-related (VectorData + related samples/tests) projects out of the main Semantic Kernel .NET solution, while introducing a dedicated MemoryConcepts sample project and a new MEVD solution file.

Changes:

• Removes most VectorData projects (and related test folders/demo) from SK-dotnet.slnx, leaving only VectorData/InMemory in the main solution.
• Adds a new MEVD.slnx containing VectorData connectors, VectorData tests, and the new samples/MemoryConcepts project.
• Introduces samples/MemoryConcepts with multiple vector store / embeddings concept samples and supporting Docker fixtures; trims VectorData-dependent caching samples from samples/Concepts.

Reviewed changes

Copilot reviewed 6 out of 41 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
dotnet/src/IntegrationTests/IntegrationTests.csproj	Removes VectorData project references from IntegrationTests project.
dotnet/SK-dotnet.slnx	Removes MEVD/VectorData projects & VectorData tests from main solution; keeps only InMemory VectorData.
dotnet/samples/MemoryConcepts/VolatileVectorStore_LoadData.cs	Adds an InMemory vector store “load from disk” sample.
dotnet/samples/MemoryConcepts/VectorStoreLangchainInterop/RedisFactory.cs	Adds Redis Langchain interop factory wrapper for VectorStore.
dotnet/samples/MemoryConcepts/VectorStoreLangchainInterop/PineconeFactory.cs	Adds Pinecone Langchain interop factory wrapper for VectorStore.
dotnet/samples/MemoryConcepts/VectorStoreLangchainInterop/LangchainDocument.cs	Adds Langchain-compatible record model.
dotnet/samples/MemoryConcepts/VectorStoreFixtures/VectorStoreRedisContainerFixture.cs	Adds Redis Docker container fixture for samples.
dotnet/samples/MemoryConcepts/VectorStoreFixtures/VectorStoreQdrantContainerFixture.cs	Adds Qdrant Docker container fixture for samples.
dotnet/samples/MemoryConcepts/VectorStoreFixtures/VectorStorePostgresContainerFixture.cs	Adds Postgres/pgvector Docker container fixture for samples.
dotnet/samples/MemoryConcepts/VectorStoreFixtures/VectorStoreInfra.cs	Adds Docker container create/delete helpers for sample fixtures.
dotnet/samples/MemoryConcepts/VectorStoreExtensions.cs	Adds helper extension methods for ingesting lists/search results into VectorStore collections.
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_Simple.cs	Adds a basic vector search sample (InMemory).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_Paging.cs	Adds paging sample for vector search results (InMemory).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiVector.cs	Adds multi-vector record search sample (InMemory).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_Redis.cs	Adds “common code + Redis backend” vector search sample (with/without DI).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_Qdrant.cs	Adds “common code + Qdrant backend” vector search sample (with/without DI).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_Postgres.cs	Adds “common code + Postgres backend” vector search sample (with/without DI).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_InMemory.cs	Adds “common code + InMemory backend” vector search sample (with/without DI).
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_Common.cs	Adds shared ingestion+search implementation used by multi-store samples.
dotnet/samples/MemoryConcepts/VectorStore_VectorSearch_MultiStore_AzureAISearch.cs	Adds “common code + Azure AI Search backend” vector search sample (with/without DI).
dotnet/samples/MemoryConcepts/VectorStore_Langchain_Interop.cs	Adds sample showing reading data ingested by Langchain.
dotnet/samples/MemoryConcepts/VectorStore_HybridSearch_Simple_AzureAISearch.cs	Adds Azure AI Search hybrid-search sample.
dotnet/samples/MemoryConcepts/VectorStore_DynamicDataModel_Interop.cs	Adds dynamic-schema interop sample (Dictionary<,> + custom model).
dotnet/samples/MemoryConcepts/VectorStore_DataIngestion_Simple.cs	Adds basic ingestion example using Qdrant + Docker fixture.
dotnet/samples/MemoryConcepts/VectorStore_DataIngestion_MultiStore.cs	Adds multi-backend ingestion example (Redis/Qdrant/InMemory) with DI and non-DI variants.
dotnet/samples/MemoryConcepts/VectorStore_ConsumeFromMemoryStore_Redis.cs	Adds sample to consume legacy IMemoryStore data via VectorStore (Redis).
dotnet/samples/MemoryConcepts/VectorStore_ConsumeFromMemoryStore_Qdrant.cs	Adds sample to consume legacy IMemoryStore data via VectorStore (Qdrant).
dotnet/samples/MemoryConcepts/VectorStore_ConsumeFromMemoryStore_AzureAISearch.cs	Adds sample to consume legacy IMemoryStore data via VectorStore (Azure AI Search).
dotnet/samples/MemoryConcepts/TextChunkingAndEmbedding.cs	Adds chunking + batching embedding generation sample.
dotnet/samples/MemoryConcepts/TextChunkerUsage.cs	Adds TextChunker usage samples (basic/custom token counter/header).
dotnet/samples/MemoryConcepts/OpenAI_EmbeddingGeneration.cs	Adds OpenAI embedding generation sample.
dotnet/samples/MemoryConcepts/Onnx_EmbeddingGeneration.cs	Adds ONNX embedding generation samples.
dotnet/samples/MemoryConcepts/Ollama_EmbeddingGeneration.cs	Adds Ollama embedding generation sample.
dotnet/samples/MemoryConcepts/MemoryConcepts.csproj	Introduces new MemoryConcepts sample/test project and references.
dotnet/samples/MemoryConcepts/HuggingFace_TextEmbeddingCustomHttpHandler.cs	Adds HuggingFace embedding sample with custom HTTP handler and SqliteVec usage.
dotnet/samples/MemoryConcepts/HuggingFace_EmbeddingGeneration.cs	Adds HuggingFace embedding generation sample.
dotnet/samples/MemoryConcepts/Google_EmbeddingGeneration.cs	Adds Google/Vertex AI embedding generation samples (including custom dimensions for GoogleAI).
dotnet/samples/MemoryConcepts/AWSBedrock_EmbeddingGeneration.cs	Adds AWS Bedrock embedding generation sample.
dotnet/samples/Concepts/Concepts.csproj	Removes VectorData connector project references (except InMemory) and adds Azure.Search.Documents package.
dotnet/samples/Concepts/Caching/SemanticCachingWithFilters.cs	Removes Redis and CosmosMongoDB caching examples.
dotnet/MEVD.slnx	Adds a dedicated MEVD solution containing VectorData connectors, tests, and MemoryConcepts.

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