change(config): Allow square brackets in network config listen addr and external addr

[arya2]

Motivation

Closes #8476.

PR Author Checklist

Check before marking the PR as ready for review:

• Will the PR name make sense to users?
• Does the PR have a priority label?
• Have you added or updated tests?
• Is the documentation up to date?

For significant changes:

• Is there a summary in the CHANGELOG?
• Can these changes be split into multiple PRs?

If a checkbox isn't relevant to the PR, mark it as done.

Solution

Try adding the default port to the config value and parsing that as a SocketAddr before trying to parse it as an IpAddr

Testing

Manually tested that the config accepts [::]

Review

Anyone can review.

Reviewer Checklist

Check before approving the PR:

• Does the PR scope match the ticket?
• Are there enough tests to make sure it works? Do the tests cover the PR motivation?
• Are all the PR blockers dealt with?
  PR blockers can be dealt with in new tickets or PRs.

And check the PR Author checklist is complete.

[oxarbitrage]

thanks!