RDMR-1284 add EdgeToEdgeGlyphTheme preference to SystemBarPlugin

[EiyuuZack]

Platforms affected

Android

Motivation and Context

Android status bar glyph color was relative only to the system color scheme when in edge to edge, not the application color. This change also doesn't determine the glyph color from the application color, but exposes a mechanism for developers to set it themselves.

Description

new Cordova preference EdgeToEdgeGlyphTheme to allow developers to set the glyph color to light or dark. Only effects apps when edge to edge is enabled.

Testing

Manually tested.

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