Maven was configured to build quietly, which means that we can't easily
see if there are any issues and there is no summary of the tests that
have run.

Added maven configuration to ensure that the tests print a summary.

- Add validation to /import payload
- Move import logic to service bean
- Track whether entities have been created or update
- Report number of created and updated entities as return value for the
  import endpoint
- Add some test coverage to exercise the validators

Refactor Docker Compose setup to include distinct services for building, testing,
and running the application.

Use separate Dockerfiles and configurations for each phase to isolate concerns and
improve workflow.

Quiet down the maven logs and set log levels to WARN so there is less noise in the
logs.

Update README file with information on running the project.

Implement TestResultService tests and supporting entity builders.
Switch to Apache Commons Math library for descriptive statistics.