Add bazel modules for Skottie and sksg

This makes skottie::Logger pure virtual as a drive-by cleanup
(it came up while fixing a linker error due to using cc_binary
instead of skia_cc_binary).

I didn't migrate skottie_tool_gpu but should be able to in a follow-on
CL.

Change-Id: I28b4e04c6ee4b0a9f35903d7ea074936896141df
Bug: b/40045064
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/808402
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
12 files changed