[Graphite] Add VulkanTexture class.

Bug: b/246393043
Change-Id: Id09e877e328565d89c39f14e4675f3b2132bf96b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/607003
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
12 files changed