HandsSystem Refactor (#38438)

* checkpoint

* pt 2

* pt... i forgot

* pt 4

* patch

* More test fixes

* optimization!!!

* the REAL hand system

* fix RetractableItemActionSystem.cs oversight

* the review

* test

* remove test usage of body prototype

* Update Content.IntegrationTests/Tests/Interaction/InteractionTest.cs

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

* hellcode

* hellcode 2

* Minor cleanup

* test

* Chasing the last of the bugs

* changes

---------

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

Content.Shared/Item/SharedItemSystem.cs

@@ -110,7 +110,7 @@ public abstract class SharedItemSystem : EntitySystem
         if (args.Handled)
             return;
 
-        args.Handled = _handsSystem.TryPickup(args.User, uid, animateUser: false);
+        args.Handled = _handsSystem.TryPickup(args.User, uid, null, animateUser: false);
     }
 
     private void AddPickupVerb(EntityUid uid, ItemComponent component, GetVerbsEvent<InteractionVerb> args)