[Motion] Provide `animator` analogues to `MaterialFade` and `MaterialFadeThrough` transitions

@hunterstich is already working on this.

Since Jan 31, 2023.

**Is your feature request related to a problem? Please describe.**
I am trying to leverage `MaterialFade`, `MaterialFadeThrough`, and others in my app. While these work fine as fragment transitions, they completely fail as view transitions for the following reasons:

- The "one-and-done" nature of transitions causes visual errors when the element being transitioned translates in any capacity
- Transitions cannot be substituted in to older APIs (See: Dialogs)
- Using transitions often fails for custom views

I would be much better if I was able to use these transitions as a native `ObjectAnimator` that does not suffer from these issues.

**Describe the solution you'd like**
I want `animator`/"Compat" emulations to at least `MaterialFade` and `MaterialFadeThrough` included in MDC's resources. If possible, having analogues for the `MaterialSharedAxis` transitions would also be nice, albeit I do not need such at the moment.

These should be as faithful as possible to the actual `Transition` implementations, but as `ObjectAnimator` instances that would be more reliable as view animation.

#2998 has an example of such an emulation of `MaterialFade`, albeit it is not an exact recreation.

I don't imagine this would be difficult, as the fade transitions seem to just be a combined scale and fade with specific interpolators and durations. "Container Transform" animations can't be converted to an `ObjectAnimator`, so I do not expect such to be implemented.

**Describe alternatives you've considered**
Doing this myself. However, I am not knowledgeable about the exact nature of the transitions, and they would likely differ from the real `MaterialFade` that I use in my app. I would like the guarantees that a MDC-included implementation is faithful to the material design specification.