[skottie] cleanup: move transform & camera adapters to own CUs

Shuffling code around, no functional changes.

TBR=
Change-Id: I9a045fa643fbcf52c58e1378d4d4c1566c0d35d7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262225
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
14 files changed