## Follow up to #3229
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### NOTE
Marking this not as a draft so that the CI will run, but added the "DO NOT MERGE ⚠" tag as we might come up with further improvements to add to this PR before actually deciding to merge this and finalize the package.
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## PR Type
What kind of change does this PR introduce?
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- Bugfix
- Feature
- Refactoring (no functional changes, no api changes)
<!-- - Build or CI related changes -->
<!-- - Documentation content changes -->
<!-- - Sample app changes -->
<!-- - Other... Please describe: -->
## Notable changes
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This PR includes some refinements and tweaks to the `Microsoft.Toolkit.Mvvm` package, like:
- Added new `ObservableRecipient.SetProperty` overloads with `Expression<Func<T>>` and `bool broadcast` params
- Fixed a possible bug in `Messenger.Type2.Equals` (just to be extra sure)
- Improved codegen for `ObservableRecipient.Set<T>(ref T, T, string)` (missing `EqualityComparer<T>.Default.Equals` inlining)
## PR Checklist
Please check if your PR fulfills the following requirements:
- [X] Tested code with current [supported SDKs](../readme.md#supported)
- [ ] ~~Pull Request has been submitted to the documentation repository [instructions](..\contributing.md#docs). Link: <!-- docs PR link -->~~
- [ ] ~~Sample in sample app has been added / updated (for bug fixes / features)~~
- [ ] ~~Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets)~~
- [X] Tests for the changes have been added (for bug fixes / features) (if applicable)
- [X] Header has been added to all new source files (run *build/UpdateHeaders.bat*)
- [X] Contains **NO** breaking changes
