Add wrappers for Stable Diffusion 3.5 Large model

[swha815]

• Wrappers for CLIP/T5 text encoders, Transformer, and VAEDecoder contained in SD3.5 Large model.
• Support for exporting any or all of the above component output generated from dummy input (normal-distributed random values).

Change-Id: I3bc202e2e856a81c6598cf01cdcd8ec158694c25

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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[zingo]

Hi @digantdesai adding "Help wanted" to check it's ok to add this to the global example folder?