Move DispatcherQueueTimerExtensions to Microsoft.Toolkit.Uwp

[michael-hawker]

Fixes #3706

Moves this class to where it should be next to our other DispatcherQueue Extensions. 🙂

PR Type

What kind of change does this PR introduce?

• Refactoring (no functional changes)

What is the current behavior?

Was in the UI package.

What is the new behavior?

In the UWP package.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Pull Request has been submitted to the documentation repository instructions. 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
• New major technical changes in the toolkit have or will be added to the Wiki e.g. build changes, source generators, testing infrastructure, sample creation changes, etc...
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

Other information

[ghost]

Thanks michael-hawker for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

[Rosuavio]

Tested, working fine.

[ghost]

Hello @michael-hawker!

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