WIP local relay model

[danieldaquino]

Summary

Warning

Still very experimental. It compiles and many features seem to be functional, but many things are still broken

Checklist

• I have read (or I am familiar with) the Contribution Guidelines
• I have tested the changes in this PR
• I have opened or referred to an existing github issue related to this change.
• My PR is either small, or I have split it into smaller logical commits that are easier to review
• I have added the signoff line to all my commits. See Signing off your work
• I have added appropriate changelog entries for the changes in this PR. See Adding changelog entries
  • I do not need to add a changelog entry. Reason: [Please provide a reason]
• I have added appropriate Closes: or Fixes: tags in the commit messages wherever applicable, or made sure those are not needed. See Submitting patches

Test report

Please provide a test report for the changes in this PR. You can use the template below, but feel free to modify it as needed.

Device: [Please specify the device you used for testing]

iOS: [Please specify the iOS version you used for testing]

Damus: [Please specify the Damus version or commit hash you used for testing]

Setup: [Please provide a brief description of the setup you used for testing, if applicable]

Steps: [Please provide a list of steps you took to test the changes in this PR]

Results:

• PASS
• Partial PASS
  • Details: [Please provide details of the partial pass]

Other notes

[Please provide any other information that you think is relevant to this PR.]

[danieldaquino]

Moved this to #3204