UICollectionViewLayout+InteractiveReordering

Summary:
## Stack
We aim to remove +load methods from the codebase to reduce pre-main startup time and to unblock enabling startup optimizations

## Diff
UICollectionViewLayout+InteractiveReordering marked as Internal in IGListKit. I am assuming that this is an internal implementation detail of the IGListKit and is not supposed to run globally outside of the IGListKit context. Based on that assumption I migrated global +load API to a `setup` method, which is being execution in IGListAdapter constructor, core class of the IGListKit library

Reviewed By: AfrazCodes

Differential Revision: D81592721

fbshipit-source-id: 718b936e669669c66ec5b6c80fefc4bd106170c2

Author: Yury Dymov

Source/IGListKit/IGListAdapter.m

@@ -52,6 +52,7 @@ - (instancetype)initWithUpdater:(id <IGListUpdatingDelegate>)updater
     IGParameterAssert(updater);
 
     if (self = [super init]) {
+        [UICollectionViewLayout setupInteractiveReordering];
         NSPointerFunctions *keyFunctions = [updater objectLookupPointerFunctions];
         NSPointerFunctions *valueFunctions = [NSPointerFunctions pointerFunctionsWithOptions:NSPointerFunctionsStrongMemory];
         NSMapTable *table = [[NSMapTable alloc] initWithKeyPointerFunctions:keyFunctions valuePointerFunctions:valueFunctions capacity:0];

Source/IGListKit/Internal/UICollectionViewLayout+InteractiveReordering.h

@@ -13,6 +13,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface UICollectionViewLayout (InteractiveReordering)
 
+// Should be called once to swizzle native APIs
++ (void)setupInteractiveReordering;
+
 - (void)ig_hijackLayoutInteractiveReorderingMethodForAdapter:(IGListAdapter *)adapter;
 
 - (nullable NSIndexPath *)updatedTargetForInteractivelyMovingItem:(NSIndexPath *)previousIndexPath

Source/IGListKit/Internal/UICollectionViewLayout+InteractiveReordering.m

@@ -16,7 +16,7 @@ @implementation UICollectionViewLayout (InteractiveReordering)
 
 static void * kIGListAdapterKey = &kIGListAdapterKey;
 
-+ (void)load
++ (void)setupInteractiveReordering
 {
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{