test: move ci to gh-actions

[erisu]

Motivation and Context

Use GitHub Actions instead of third-party CI services.

Description

• Created GitHub Actions Task
• Move all Travis CI & AppVeyor jobs to GitHub Actions
• Run only one Travis CI job for codecov reports. (Job Environment: Linux + Node 12)

Codecov has a better UI but requires setting secrets in GH which we do not have the direct ability to set. If we want to continue supporting and using Codecov, we would need to community with INFRA to set the secret token.

Testing

• https://github.com/erisu/cordova-android/commit/0e3bda75114f84788ff6b5319b65dd62e0deda02/checks?check_suite_id=401547626

Checklist

• I've run the tests to see all new and existing tests pass

[erisu]

Please ignore that the AppVeyor CI service is failing. AppVeyor would be turned off as this would replace it.

[dpogue]

👍 from me

[codecov-io]

Codecov Report

Merging #895 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #895   +/-   ##
=======================================
  Coverage   65.94%   65.94%           
=======================================
  Files          21       21           
  Lines        1850     1850           
=======================================
  Hits         1220     1220           
  Misses        630      630

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