cli: add 'port_forward' subcommand for ln

[f3r10]

Add a subcommand for port forwarding from ln pods to a local port so a ln pod can be referenced from the host machine.

[pinheadmz]

Thanks for contribution! And sorry about the linter, everyone hates it (sigh) see https://github.com/bitcoin-dev-project/warnet/blob/main/docs/developer-notes.md#formatting--linting

Since you're using stream_command it's blocking -- which is fine if you only need one at a time, how have you been dealing with simln and (I assume) a cluster of LN nodes? It might make more sense to even spawn a pool of threads for all the nodes, maybe even spit out a config file for simln

[f3r10]

yes, you are right it would be better to spawn a pool of threads for all the nodes, I will update that part.

[bdp-DrahtBot]

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #713 (Add CLN support by macgyver13)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.