Add support for SD 3.5 IP-Adapters

[vladmandic]

First IP-Adapter for SD 3.5 just released at https://huggingface.co/InstantX/SD3.5-Large-IP-Adapter
with code for the modified pipeline available in the same location.

Ask is to integrate support for SD 3.5 IP-Adapter into standard t2i/i2i/inpaint pipelines

@yiyixuxu @sayakpaul @DN6 @asomoza

[sayakpaul]

CC @fabiorigano as well. Since the code is already out I think it might be nice to open this to the community and we help along the way. Maybe we give it a week and if it's not picked up we integrate ourselves. @asomoza meanwhile, maybe you could run some tests as well?

[yiyixuxu]

cc @haofanwang too

[guiyrt]

I started working on it and have a first draft without modifying the original code, but takes a while to test because SD3.5 is too big for my GPU.

For this PR, is the goal to have the pipeline with no changes as a community pipeline or as an optimized pipeline in src/pipelines? I noticed that it's not inheriting IPAdapterMixin loader, for example. This is my first contribution, still learning about repo structure :)

Edit: I know issues labeled as "New pipeline/model" are regarded as most difficult in the contributor guidelines, but as there is already working code, this should be easier to pick-up (hopefully) 🤞