Mark a few protocols with NS_SWIFT_UI_ACTOR to avoid concurrency errors

Summary:
## Context
We are building native prototype for the GenAI native intent proposal that's being currently reviewd by MZ. Current version is meant for internal dogfooding but pending proper plan for the public rollout

This stack is intentionally cutting some corners from the [original figma spec](https://www.figma.com/file/JuCEe2ppgOHCtljPdiuGZ5/Meta-AI-Imagine-%E2%80%94-FoA-alignment-%E2%80%94-MZ-Deck-%E2%80%94-V3?type=design&node-id=107-35979&mode=design&t=hvEAmIjKvjB3xvyC-0) in favour of getting this into the hands of stakeholders sooner

## This diff
Makign this into a separate diff in case I will need to update codebase to match this declaration (or revert 🙂)

Reviewed By: corywilhite

Differential Revision: D56825302

fbshipit-source-id: 49ff96f546d2be0dc3b371a4c7bf48841ad72425

Source/IGListKit/IGListAdapterDataSource.h

@@ -22,6 +22,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  Implement this protocol to provide data to an `IGListAdapter`.
  */
+NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListAdapterDataSource)
 @protocol IGListAdapterDataSource <NSObject>
 

Source/IGListKit/IGListSingleSectionController.h

@@ -43,6 +43,7 @@ typedef CGSize (^IGListSingleSectionCellSizeBlock)(id item, id<IGListCollectionC
 /**
  A delegate that can receive selection events on an `IGListSingleSectionController`.
  */
+NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListSingleSectionControllerDelegate)
 @protocol IGListSingleSectionControllerDelegate <NSObject>