libctf: types: access to raw type data

This new API lets users ask for the raw type data associated with a type
(either the whole lot including prefixes, or just the suffix if this is not
a CTF_K_BIG type), and then they can manipulate it using ctf.h functions
or whatever else they like.  Doing this does not preclude using libctf
querying functions at the same time (just don't change the type!  It's
const for a reason).

New API:

+const ctf_type_t *ctf_type_data (ctf_dict_t *, ctf_id_t, int prefix);

This function was unimplementable before the DTD changes, because the
ctf_type_t and vlen were separated in memory: but now they're always stored
in a single buffer, it's reliable and simple, indeed trivial.

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