MAUI CommunityToolkit MVVM auto instrumentation of async commands

[aritchie]

This is a POC to try to insert auto instrumentation of async operations that occur in commands. The MVVM Community Toolkit is insanely popular in .NET MAUI. This will be a key component to making #3181 awesome.

This is a draft PR to collect thoughts

TODO

• Tests
• Samples
• Deployment
• Documentation

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- MAUI CommunityToolkit MVVM auto instrumentation of async commands ([#4125](https://github.com/getsentry/sentry-dotnet/pull/4125))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

Generated by 🚫 dangerJS against 017f7f1