Write/read telemetry data into/from databases

[tmf97]

We have our databases setup in db.py but we never actually write any data to them anywhere in flight software.
The general idea for our telemetry database is that we want to:

• write all our data from our sensors to the database every X seconds, where X is a parameter (something in the range between 15 and 600 seconds, it should be changable in flight)
• downlink data from our databases on request - essentially make a db query that's integrated with our command/downlink structure

[sjz38]

Make sure to add this to Jira if you haven't yet!

[tmf97]

Done: CISLUNAR-64