Migrate CI/CD to GitHub Actions

[mttrbrts]

As described in accordproject/technical-steering-committee#4

Please follow the conventions in accordproject/concerto#236

• Remove secrets from Travis (for AP maintainers: in Travis Repository Settings)
• Disable Travis in the configuration (for AP maintainers: Travis Personal Profile > Settings > Accord Project
• Remove .travis.yml and .travis directories in repo
• Add .github/workflows directory based on those in ./concerto/.github/workflows
• Remove scripts in ./scripts replace by those found in ./concerto/scripts
• Fix package.json notable adjustments: remove some of the old scripts, make sure code coverage works
• Test build on PR with timestamps
• Test build on GitHub release with version number
• Update GitHub "branch protection" rules to point to the new workflows instead of Travis

[Aniruddha-Shriwant]

@mttrbrts can I take this?

[jeromesimeon]

@mttrbrts can I take this?

Done and done! Your changes are now how we do CI in this repo. Thank you @Aniruddha-Shriwant for the great contribution (and being responding to requests for changes).