Animated: Avoid In-Band State Update (#49184)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49184

D65645985 shipped a refactor to `Animated`, so that it would use a custom `useAnimatedPropsMemo` instead of `useMemo`. This significantly improved update performance by no longer invalidating the `AnimatedProps` on effectively every update to `Animated` components.

However, this was measured to increase memory usage. After a few experiments, we identified that use of the in-band state update was responsible for the memory regression. While this requires further root cause investigation, this diff attempts to mitigate the memory regression.

This diff introduces a feature flag that enables an implementation that minimizes duplicated work, such as unnecessarily computing `compositeKey` or creating new instances of `AnimatedProps`. In addition, this implementation strives to do so without significantly degrading when an update is interrupted by a concurrent update.

Changelog:
[General][Changed] - Introduced a feature flag to test an optimization in `Animated` to reduce memory usage.

Reviewed By: rickhanlonii

Differential Revision: D69135223

fbshipit-source-id: a2699a314625e7570698bc41455b139711cfd7e3