Split out Swizzler opts into separate cpp files

Bug: b/40045064
Bug: b/40045066
Change-Id: I9fd6e0818b1c3aff4176af6d5a84e8e90b9a38ec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/740296
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
21 files changed