Support Multi/InfiniteTalk

[kijai]

This is somewhat work in progress PR that adds initial basic Multi/InfiniteTalk support:

• Functionality to load Multi or InfiniteTalk models as model_patch objects
• cross_attn patching function to Wan base model
• InfiniteTalk Image to video node that supports both long generation within a loop and extension with separate samplers

I've chosen not to do the MultiTalk long generation method as I find it redundant due to InfiniteTalk, MultiTalk model itself will load, but further functionality need to be added to add the audio control to other models such as VACE.

As I'm not fully versed in how everything works yet, especially memory management wise, I'll be relying on feedback from @comfyanonymous and @Kosinkadink to finish this PR.