feat(pds): Remove bucket_name from R2 Binding

[helloimalastair]

Closes #107.

When going through the creation flow for a new PDS, wrangler will now auto-create a bucket using wrangler's Automatic Provisioning feature, which should prevent collisions between multiple PDSses, as you cannot have two Workers on an account with the same name.

Example output from the deploy flow:

Experimental: The following bindings need to be provisioned:
Binding           Resource
env.BLOBS         R2 Bucket


Provisioning BLOBS (R2 Bucket)...
🌀 Creating new R2 Bucket "my-pds-pds-blobs"...
✨ BLOBS provisioned 🎉