feat!: add partial night & day theme support

[erisu]

Motivation and Context

• Add partial support for Night & Day Theming.
• Prefix Cordova core resource values with cdv_* to avoid issues caused by plugins that either create or modify the same files.

This should also:

Resolves #1485

Cover SplashScreen & Background Color. (SystemBars, such as Status Bar & Gesture/Navigation Bar, will be handled in a separate PR)

Description

• res/values/cdv_colors.xml
  • A rename from colors.xml.
  • cdv_background_color set to #FAF8FF. Same values as SDK 34+.
  • cdv_splashscreen_background set to @color/cdv_background_color to match background color.
• res/values-v34/cdv_colors.xml
  • New file
  • cdv_background_color set to @android:color/system_background_light.
  • cdv_splashscreen_background set to @color/cdv_background_color to match background color.
• res/values-night/cdv_colors.xml
  • New file
  • cdv_background_color set to #121318. Same values as SDK 34+.
  • cdv_splashscreen_background set to @color/cdv_background_color to match background color.
• res/values-night-v34/cdv_colors.xml
  • New file
  • cdv_background_color set to @android:color/system_background_dark.
  • cdv_splashscreen_background set to @color/cdv_background_color to match background color.
• res/values/cdv_themes.xml
  • A rename from themes.xml.
  • New postSplashScreenTheme default value @style/Theme.Cordova.App.DayNight.
  • Theme.Cordova.App.DayNight new theme with android:colorBackground set to @color/cdv_background_color
• res/values/cdv_strings.xml
  • A rename from cdv_strings.xml.

SplashScreen background color can be set by the following preferences, in the order of priority:

• AndroidWindowSplashScreenBackground
• SplashScreenBackgroundColor
• BackgroundColor

Previously when the preferences was set and cordova prepare was executed, colors.xml would have been updated.
Now, cdv_themes.xml would be updated instead with the #RRGGBB or #AARRGGBB value inserted into the SplashScreens windowSplashScreenBackground. Since Cordova only accepted one color value for the SplashScreen background, it was easier to change the theme instead of the four colors resource files.

Testing

• npm t
• Build App
• Tried setting preferences to another color.

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

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.24%. Comparing base (484c60e) to head (3ba2c22).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/prepare.js	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1818      +/-   ##
==========================================
+ Coverage   72.12%   72.24%   +0.11%     
==========================================
  Files          23       23              
  Lines        1844     1841       -3     
==========================================
  Hits         1330     1330              
+ Misses        514      511       -3     

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[dpogue]

LGTM