[TASK] Switch our code coverage CI from Codacy to Coveralls #659
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Coveralls does not require an API key, provides a nice GitHub Action, and it can post code coverage comments to PRs.
Also add a code coverage badge to the README.
Also align the GitHub Action workflow with that of our sister project Emogrifier.
Also add a Composer script for running the tests with coverage.
Fixes #535
Fixes #299