feat: add @capacitor-mlkit/face-mesh-detection package

[trancee]

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] The changes have been tested successfully.
• [ ] A changeset has been created (npm run changeset).

Just added the defintions, according to the Android reference. However, they might change again during implementation.

[trancee]

Looks good. Can you still fix the build and create a PR in https://github.com/robingenz/capacitor-mlkit-plugin-demo?

How do I fix the build since there is no iOS implementation? Any hints?

[robingenz]

@trancee I will take a look.

[robingenz]

@trancee Fixed! I forgot to set the correct node_modules path.

[robingenz]

@trancee Can we merge this?

[trancee]

@trancee Can we merge this?

Yes, I am done with the Android implementation.