This is a complement of the get_sources function. I don't want to extend
the existing function to avoid unplesant surprises. If the new function
works well in practice, I'll phase out the old one over time.
Move radicle_ci_broker::msg::* to radicle_ci_adapter::*. This is meant
to make building adapters in Rust to build much faster, as they only
need to build new radicle_ci_adapter crate, not the whole of
radicle_ci_broker.
Lars Wirzenius