[Investigate]: add UI proof/picture "evidence"

[meganwolf0]

Is your feature request related to a problem? Please describe.

There appears to be some use cases where a screenshot is valid "proof" that something is being performed, and generally there may be control satisfaction cases that would be most easily captured as a picture as opposed to trying to assess some declarative proof (e.g., in the form of a config or manifest). Would it be worthwhile investigating possible solutions to programmatically capture screenshots or measure existence of UI fields? This would probably only perform half of a Lula Validation, since policy probably couldn't check the content, but it could save some time with automated collection, repeatability, and mapping evidence to a control.

Additional context

Some go libraries that may provide functionality that would assist:

• https://github.com/chromedp/chromedp
• https://go-rod.github.io/#/