deprecate: CoreAndroid.getBuildConfigValue

[breautek]

Platforms affected

Motivation and Context

We have 2 copies of an implementation of getBuildConfigValue, one inside CoreAndroid and another in BuildConfig.
The BuildConfig variant was directly migrated from our old deprecated cordova-plugin-compat package, so it is more likely that the BuildConfig variant is used more than the CoreAndroid version.

Description

Added @Deprecated decorator for build compilation warning.

Add @deprecated JavaDoc for code editor hints and information on how to migrate.

Changed CoreAndroid.getBuildConfigValue to simply call and return the result of BuildHelper.getBuildConfigValue

Note that the screenshots are from a test app that was changed to use the deprecated API in the MainActivity. MainActivity template doesn't actually use the deprecated API.

Testing

npm test and manual 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

Merging #1597 (6a39057) into master (2252c09) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1597   +/-   ##
=======================================
  Coverage   71.82%   71.82%           
=======================================
  Files          23       23           
  Lines        1796     1796           
=======================================
  Hits         1290     1290           
  Misses        506      506           

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