LTC6804 Renode Mock, Proof of Concept

[nwdepatie]

Since shepherd builds now (whoo!) we can now start on integrating some development practices we've been honing on Cerberus, specifically Renode.

This ticket involves creating a Python mock of the LTC6804 chips, more specifically emulating the data that we are getting from the segments. To implement the whole piece of code is probably too much, for now we should create a proof of concept to show that we can interface with the LTC driver with Renode and supply sample data in a Python script.

[dyldonahue]

closing because Renode is out of scope rn, will revisit in the summer