Exposed SkMesh

Exposed skMesh through Mesh API, utilizing makeVertexBuffer,
makeIndexBuffer, make, and makeIndexed. Uniforms are set through
set<>Uniform methods, where the native mesh will then be updated upon
each call to set<>Uniform.

Bug: b/254354591
Test: built hwui
Change-Id: Ia100f00a1e29198e30dfd25999f8bd8db9fb3ca0