[skottie] Move text editor sources to utils

Change-Id: Ic1296671b81daa91ed86dae1db20d6b511d77c8a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/748458
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
8 files changed