Add `forcepack` flag that will force conversion to AFBC-packed right after a texture is uploaded when possible. We only pack 2D resources larger than 32x32 as of now. Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25012>