Bug 2004947 - Remove cargo dependency from embedded-uniffi-bindgen

[bendk]

Instead we do some parsing of the Cargo.toml files ourselves. I ran cargo uniffi-bindgen generate -l kotlin --library ~/application-services/target/debug/libmegazord.so with both the old and new version and the contents were identical.

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • 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
• 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.
• Tests: This PR includes thorough tests or an explanation of why it does not
• 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
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due diligence applied in selecting them.

[mhammond]

this is great, thanks! I agree we should try and upstream this into uniffi itself, I guess behind another feature?