[skottie] Refactor animators

Separate storage for values, cubic maps, repeated values deduplication.

TBR=

Change-Id: Ibfbcea91ef1d7b1da937b4af44079e7612d410cb
Reviewed-on: https://skia-review.googlesource.com/99981
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
3 files changed