Enabling EXTRA_TCP_STACKS on stable/13

From: Gordon Bergling <gbe_at_freebsd.org>
Date: Fri, 22 Apr 2022 15:55:19 UTC

I recently build some personal infrastructure and experimented a little
bit with tcp_bbr(4) and tcp_rack. Doing is this in a cloud environment
is a little bit priced since the kernel must be rebuild with the build
options EXTRA_TCP_STACKS defined.

Would it be feasable to switch this option to on by default?

I would think that the rack and bbr are stable enough for further