Add Flight tracking functionality

[mikedevita]

add functionality to refresh Flights on an interval by doing:

• define required models in schema.prisma
• define getVAFlights method in OnAir.ts to fetch VA Flight data from the OnAir Api
• define new FlightTranslator class in `translators/FlightTranslator.ts' to translate an OnAir flight into a Prisma/db Flight
• define new FlightProcessor class in processors/FlightProcessor.ts to process each OnAir flight
• define refreshVAFlights method in OnAir.ts to call getVAFlights() and use the new FlightProcessor class to update the Flights
  • use refreshVAFleets as a mock example for refreshVAFlights

next, add functionality to track when Flights depart, arrive, and send an Event. Details for this still TBD.

This depends on database persistence being implemented first #8

[kbieda]

+1 vote!