WIP on theme-color/viewport-fit

[dpogue]

Not finished, not completely working, but might be good to get some eyes on this.
Hacky test project: https://gist.github.com/dpogue/f548df1ec6adf2662485b29599688f23

Platforms affected

Android

Motivation and Context

Description

• Fixes the issue where insets were not zeroed out when the WebView was not displayed edge-to-edge

TODO

• JS to set StatusBarBackgroundColor preference as cdv_statusbar_background_color in cdv_colors.xml during prepare
• JS to observe changes to the viewport and theme-color meta tags
• Figure out what to do if the webview is not up to date and doesn't support safe-area-inset variables
• Figure out what to do with the navigation bar
• Finish moving the rest of the view logic from SystemBarPlugin to CordovaActivity
• Make sure hiding the status bar entirely works
• Make sure fullscreen mode works
• Make sure immersive mode works
• Test every combination on every single SDK from 24 to 37 and document the results 😩
• Figure out if this breaks existing behaviour in cordova-android 15.x

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.20%. Comparing base (3fd12df) to head (365db93).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2010   +/-   ##
=======================================
  Coverage   63.20%   63.20%           
=======================================
  Files          24       24           
  Lines        4922     4922           
=======================================
  Hits         3111     3111           
  Misses       1811     1811           

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[GitToTheHub]

Cool, nice PR :)