This PR adds support for `GPU_storagebuf_clear` and
`GPU_storagebuf_clear_zero` to the Vulkan backend. It also adds test
cases for all backends.
Pull Request: blender/blender#105487
The _gpu_ prefix is redundant as they are inside a namespace
and run as part of a test suite that already contain the name
gpu. (GPUOpenGLTest)
This patch also moved the texture test cases to its own
compile module.
