Create a free-form pen drawing tool so users can annotate their screenshots

[ryan953]

Adds a free form drawing pen tool. This will not have the ability to undo, or select and move annotations. Once something is drawn, it won't be removable. The freeform tool is going to be flexible and won't conflict with cropping. You can do either in any order.

To use it, you click it and the button will be highlighted. To stop annotating, click the button again. The drawing will only happen on mouse down. The canvas with the annotation will collapse into the image each time you stop annotating
Colors and line thickness are out of scope for this ticket. The pen will be black to start.

Test to ensure it works well on all browsers: Chrome, Firefox, Safari
Test to make sure the image quality and line crispness is high
Deploy on an alpha branch and have test orgs to test it out: GibPotato, NugetTrends, Sentry
Add experimental SDK config field to control whether it's shown or not