V2 rewrite - implement recording

[bskdany]

Initial scaffolding is being done on the rewrite-scaffold branch, branch off it.

There record.py class scaffold has been built as a singleton. It's needs to be connected with asyncio to the api routes so that it performs the actions pointed out in the comments above the class:

# saves data in the "recordings" dir
# recording dir has child dirs for each mission, the default name is the timestamp but it should have the ability to be renamed
# each child dir has a raw and a parsed version of the incoming radio data
# the raw data should be in hex format
# the parsed data should be a collection of csvs, one for each sensor type
# the recoding class is a singleton, which means it can only be instantiated once
# it's methods are async, which means we don't need threads or processes, just one asyncio task