feat: Digital ink recognition

[robingenz]

Is your feature request related to a problem? Please describe:

The ML Kit Digital Ink Recognition API is not yet supported.

Describe the solution you'd like:

Add a Digital Ink Recognition plugin.

Describe alternatives you've considered:

Additional context:

[robingenz]

This issue can be sponsored if interested. Please contact us in advance by email and mention the issue. PRs are also welcome.

[ideaOwl]

Quite interested in seeing this happen, since I'm prototyping an idea that'll require it. Happy to test when it comes in, looks like the pull request had a lot done on it, what's missing @robingenz?

[robingenz]

The implementation is missing. This is just the boilerplate code.