Introduce TransformationMatcher and Transformation.Factory

This CL introduces TransformationMatcher and Transformation.Factory. The
goal of this change is twofold:

1. It lifts the ElementMatcher out of the Transformation interface.
2. It ensures that we use different transformation objects when multiple
   elements match the same transformation. This will be important once
   transformation become stateful (e.g. with Motion Mechanics or custom
   transformations), as we don't want different elements to implicitly
   share the same transformation state.

Bug: 376438969
Test: atest PlatformComposeSceneTransitionLayoutTests
Flag: com.android.systemui.scene_container

Change-Id: I91409aa399cf77960bf8aa8cbd540eb529f313b3