TAP Formatter for GitHub Actions

Changes for 0.3.3

• New release 🎉 packed with tests & a nifty feature!
• Workflow summaries!
• Due to a limitation on GitHub there can only be 10 annotations displayed in any given workflow run. No matter how many error annotations your run raises, only the first 10 will be visible.
• Nevertheless, there's a Workflow Summary provided that doesn't suffer from this limitation. It'll be always linked as a notice at the beginning of every file containing a failing error.
• Refactored much of the logic to use aggregation based on TAP test number, it greatly simplified the code and made it much more testable.
• Happy prove-ing with GitHub Actions!