Create GitHub Action workflow for test running

1. The workflow needs to be able to pull in a YugabyteDB - the URL for which will be passed by the user manually.
    a. Then it should execute the command to start a `yugabyted` cluster in order to get a YugabyteDB instance running.
2. It should run each test class individually.
3. The workflow also needs to be run when a PR is raised against the `main` branch of this repository.