Improve CI

[TheBuggedYRN]

Summary of Changes

• Rename jobs to the following format <action>_<platform>.
• Extract danger to a separate job.
• Extract lint_flutter to a separate job.
• Check for format in lint_flutter job.
• Use Android Orb for test_android job.
• Clone Escape via SSH.

Checklist

• [ ] In addition to adding the new API to Dart, I have also added its implementation to both iOS and Android.
• [ ] I have added at least 1 unit test in Dart for the new API and made sure the tests pass locally.
• [ ] I have updated README.md to add the new API.

[codecov[bot]]

Codecov Report

Merging #226 (3a3cfd9) into master (be7d9b3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #226   +/-   ##
=======================================
  Coverage   72.55%   72.55%           
=======================================
  Files          16       16           
  Lines         470      470           
=======================================
  Hits          341      341           
  Misses        129      129           

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[TheBuggedYRN]

Will be done in multiple separate PRs