[canvaskit] Enable font edging

Adding in the mono rasterizer on freetype adds 12k of code size
(6k compressed), so we make it opt out and don't ship to npm with it.

Bug: skia:10192
Change-Id: I8352adbeaec288800ae1ca4709144860e9a1e84c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/288546
Reviewed-by: Ben Wagner <bungeman@google.com>
6 files changed