radv: implement radv_shader_create_cached()

radv: implement radv_shader_create_cached()

This function takes a radv_shader_binary and writes it to the
disk cache before creating and returning a radv_shader cache entry.
The key of the cache entry is the full SHA1 hash of the binary.
This way, we will be able to deduplicate identical shaders.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22030>