[Pipelines] Add a T2I-Adapter pipeline

[huo-ju]

Model/Pipeline/Scheduler description

T2I-Adapter is a simple and small (~70M parameters, ~300M storage space) network that can provide extra guidance to pre-trained text-to-image models while freezing the original large text-to-image models.

It has 3 pre-trained models can work with Stable Diffusion 1.4 (and other finetuned Stable Diffusion 1.4 models)

I have a basic integration StableDiffusionT2IAdapterPipeline , and I'm wondering if it is possible to contribute it become a official (or community) pipeline?

Open source status

• The model implementation is available
• The model weights are available (Only relevant if addition is not a scheduler).

Provide useful links for the implementation

Official implementation of T2I-Adapter: https://github.com/TencentARC/T2I-Adapter/
Pre-trained models: https://huggingface.co/TencentARC/T2I-Adapter/tree/main/models
My basic diffusers pipeline integration: https://github.com/huo-ju/diffusers

[takuma104]

Duplicated? #2390

[github-actions]

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