Add ls and add swarming commands

[samuelbacaner]

This PR adds the /swarm/peering/ls and /swarm/peering/add commands. I'm working on a project where these commands would be really useful so putting this PR up for consideration.

In order to test, I pulled down ipfs/kubo, ran docker compose up, and ran the shell_test.go against the container.

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[sam-bacaner]

@aschmahmann , tagging you as a recent contributor. I don't see any kind of needs-triage tag or similar. Please let me know if there's anything I can do to help you or others review this PR.

[Stebalien]

Thanks! Especially for writing the test!

[sam-bacaner]

Of course! Thanks for the quick review!