Move three Op-derived classes to the skgpu::v1 namespace

GrRegionOp
GrShadowRRectOp
GrStrokeRectOp

Bug: skia:11837
Change-Id: I0b573031acb13138e1549712c555337247e0a08e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/442836
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
8 files changed