Add support for setting per-corner radius in SurfaceFlinger

Additionally, this allows for the client to set distinct corner
radii when setting clientDrawnCornerRadius

Flag:com.android.graphics.surfaceflinger.flags.set_distinct_corner_radii
Test: atest SurfaceFlinger_test libsurfaceflinger_unittest
Bug: 406554726
Change-Id: Id0f1210df9ed3a0614993bbfb006cb6f29a52263