bfdd,lib: implement protocol profile selection

Implement the infrastructure for other protocols daemon (e.g. `bgpd`,
`ospfd`, `isisd` etc...) to communicate to BFD daemon which profile
they want to use with their peers.

It was also added the ability for protocols to change profile while
running (no need to remove the registration and then register again).

The protocols message building function was rewritten to support
multiple arguments through `struct bfd_session_arg`, so we can
implement new features without the need of changing function
prototypes. The old function was also rewritten to keep
compatibility.

The profile message part is only available for BFD daemon at the
moment.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

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