Add CI and some tests

[Lun4m]

• API

  • Endpoint tests

• Ingestor

  • Test insert_data
  • Test timeseries_is_open
  • Mock permission tables
  • Unit tests
  • Test filter_and_label_kldata
  • Test kldata endpoint

• End-to-end

  • Mock permission tables
  • Add example tests
  • Fix bugs

[Lun4m]

After speaking with Ingrid yesterday, I think I will refactor most of prepare_db.rs, ingestion.rs, and api.rs into different end-to-end tests so we will have everything in one file, while still keeping the same coverage.