Deprecate PermissionHelper

[GitToTheHub]

• The PermissionHelper was for cordova-android versions pre 5.0.0. Since cordova-anroid 5.0.0 the relevant permission methods can be called directly on CordovaInterface.

Platforms affected

Motivation and Context

Description

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 60.79%. Comparing base (cab5c5b) to head (c9dfe7e).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1857       +/-   ##
===========================================
- Coverage   72.12%   60.79%   -11.33%     
===========================================
  Files          23       23               
  Lines        1844     4811     +2967     
===========================================
+ Hits         1330     2925     +1595     
- Misses        514     1886     +1372     

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