Fix for 6000.6.X: Fix some API issues from user feedback.

Unity: 2D

6.5.X

6.4.X

6.3.X

6.6.X

Created by mistake.

Feedback issues reported:

`PhysicsUserData` should give read-only access to the EntityId stored.
`PhysicsComposer` should implement `IDisposable`.
`PhysicsComposer` methods should all default to `Allocator.temp` for consistency as all other physics methods do.
Should be able to destroy all PhysicsComposer
PropertyDrawer foldouts default to open if never set via the "viewDataKey" (these should default to not being expanded)
Show EntityId as tooltip for `PhysicsUserData` (show Object name and type.
Owner-only PhysicsUserData