Add GLIGEN Text Image implementation (#4777)
* Add GLIGEN Text Image implementation
* add style transfer from image
* fix check_repository_consistency
* add convert script GLIGEN model to Diffusers
* rename attention type
* fix style code
* remove PositionNetTextImage
* Revert "fix check_repository_consistency"
This reverts commit 15f098c96e00bb9e67b831161615b30a2d28d815.
* change attention type name
* update docs for GLIGEN
* change examples with hf-document-image
* fix style
* add CLIPImageProjection for GLIGEN
* Add new encode_prompt, load project matrix in pipe init
* move CLIPImageProjection to stable_diffusion
* add comment
