feat(identify): do not implicitly dial on push

[thomaseizinger]

Description

Previously, we would implicitly establish a connection when the user wanted to push identify information to a peer. I believe that this is the wrong behaviour. Instead, I am suggesting to log a message that we are skipping the push to this peer.

Additionally, the way this is currently implemented does not make much sense. Dialing a peer takes time. In case we don't have a connection at all, it could be that we drop the push requests because there isn't an active handler and thus we would have unnecessarily established the connection.

Instead of fixing this - which would require buffering the push messages - I think we should just remove the implicit dial.

Notes & open questions

I stumbled over this when I refactored the identify behaviour as part of #3651. Making this change will make shipping #3651 easier.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates

[mxinden]

Looks good to me. Technically I think this is a breaking change. That said, I am not aware of anyone depending on the previous (flawed) behavior. Thus fine to merge as patch release.