fbt: Add support for CTFv3 containers

The general aim in this and subsequent patches is to minimize the
amount of code that directly references CTF types such as ctf_type_t,
ctf_array_t, etc. To that end, introduce some routines similar to the
existing fbt_get_ctt_size() (which exists to deal with differences
between v1 and v2) and change ctf_lookup_by_id() to return a void
pointer.

Support for v2 containers is preserved.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit d9175438c0e77ef2b400601aa8cf8098c82a77a7)