[Screen Ruler]New feature for screen ruler, showing the measurement in an extra unit

[Sophanatprime]

Summary of the Pull Request

• Project: common/Display. Add a method to get the size of a monitor. Add methods to get MonitorInfo from a window or point. Needed for MeasureTool.
• Project MeasureTool. Besides showing the value in pixels, now we can also show the value in another unit, including inch, centimeter, and millimeter. Also, a setting property is added for this.

PR Checklist

• Closes: A suggestion for improving the display ruler - metric units #27394
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated. I did not see the doc of MeasureTool. Maybe no need for this project?
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

To convert from pixels to millimeters correctly, we need to get the physical size in pixels and the real size in millimeters of a monitor and save the ratio for later use.

Update images for the new this new feature.

Validation Steps Performed

Testing by hands, literally. Use a real ruler to measure the colored line shown on the screen, and compare it to the measurement value.

[Sophanatprime]

@microsoft-github-policy-service agree