radv/rra: Dump basic ray history tokens This only dumps the begin tokens. Tokens are written to a buffer containing a 12 byte header at the beginning. We use an intermediate format for the ray history tokens because the RRA format is very inefficient. Reviewed-by: Friedrich Vock <[email protected]> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25548>