MPP-4235: feat(relay): start android + ios bindings

[groovecoder]

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • [x] This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • ~There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved~
• [x] Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• [x] Tests: This PR ~includes thorough tests~ or an explanation of why it does not:
  • This PR only adds default wrapper and binding code as generated by cargo start-bindings
• [x] Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• [x] Dependencies: This PR follows our dependency management guidelines
  • ~Any new dependencies are accompanied by a summary of the due diligence applied in selecting them.~