[Compose] Allow custom cache keys, dynamic properties for images, and remove font remapping

[gpeal]

This set of changes is all around composition caching:

1. Increase the caching flexibility by allowing arbitrary cache keys.
2. Remove the cacheKey parameter from LottieCompositionSpec.JsonString because it was ambiguous with the new cacheKey parameter.
3. Add dynamic properties for bitmaps. This is helpful because it allows you to set a bitmap on a single LottieAnimation without overwriting the bitmap for the cacheable LottieComposition.
4. Removed fontRemapping for rememberLottieComposition because there was no way to know how to handle caching. Instead, dynamic properties can be used.

[LottieSnapshotBot]

Snapshot Tests
28: Report Diff