Particle cleanup: split SkParticleBinding out of SkParticleEffect

Also simplify type registration.

Change-Id: Ia47febb2ae2cd5821476c3dd33a688b688aa6d6d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/238359
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
8 files changed