Implement GitHub Actions

[robertsoniv]

We should take advantage of GitHub Actions in order to:

ON PR TO DEVELOPMENT

1. Automatically run unit tests
2. Automatically run the build
3. Enforce that both of these are passing with at least 1 review before allowing the PR to be merged.

ON MERGE TO MAIN

Alternatively, this could be on create release and skip step 3

1. Automatically run the build
2. Create a build artifact
3. Create a release and tag with the appropriate next semantic version
4. Publish the build artifact to NPM
5. Generate release notes