[skottie] Effects cleanup pass

Split-off effects into separate CUs.

TBR=
Change-Id: Ic214027d27e1c341085d9a8c74f605caba260630
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221118
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
16 files changed