nvk: Add a new arena data structure

This is about 80% of what nvk_heap does today but with the explicit goal
of just pulling out the growable memory arena part out and separating
all of the heap logic.

Reviewed-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35327>
3 files changed