TravisCI to GitHub Actions Migration.

[dveeden]

• Setup GitHub Actions for CI (Add GitHub actions #488 )
• Update status badge in README.md (CI: Update help_drv_mysql.t and status badge #491 )
• Create coverage data with ./configure --enable-coverage --enable-asan --enable-msan --with-mysql --with-pgsql
• Change coveralls to GitHub Action: https://github.com/marketplace/actions/coveralls-github-action
• Update coveralls badge in README.md
• Build with PostgreSQL Support (CI: Also build with PostgreSQL support #493 )
• Run make distcheck
• Run with multiple GCC and Clang versions
• Run CI on macOS
• Remove .travis.yml
• Consider building packages/releases via CI (Like feat [CI] : Container Image Build CI for Push image to github registry #442 )