Remove ExperimentalDeferredTransitionApi

Removes the @ExperimentalDeferredTransitionApi annotation and promotes
deferred transition APIs (DeferredTransitionState, DeferredTransition,
rememberDeferredTransition, DeferredAnimatedContent,
DeferredAnimatedVisibility, MutableTransform, MutableContentTransform,
and TransformScope) so they no longer require experimental opt-in.

Test: ./gradlew :compose:animation:animation:assembleAndroidTest
Test: ./gradlew :compose:animation:animation-core:assembleAndroidTest
Relnote: "Removed `ExperimentalDeferredTransitionApi`. Deferred
 transition APIs no longer require experimental opt-in."
Change-Id: Ib64300bf3bce149fe8119343be539859c4ae084b