mesa: translate into pipe_sampler_state in GL functions

mesa: translate into pipe_sampler_state in GL functions

- pipe_sampler_state is added into gl_sampler_attrib.
- The border color field is redundant, so the non-gallium field is removed.
- Other GL fields are still tracked because of glGet.
- Some fields are not set by GL functions because they are always derived
  from multiple states.
- The behavior in GL functions is the same as st_convert_sampler.

This reduces overhead by 2% for drawoverhead/8 textures, and more is going
to be done.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11339>