integration test

[tahnok]

Idea: add a series of tests that interact with a real ring to verify functionality (like changing python versions, or a new ring)

I think this could be a big pytest file, but it shouldn't be executed by default, you should need to invoke/run it explicitly

Things to check:

• can get info (firmware / hardware version) and battery
• can get steps and hr log (shouldn't expect any particular response, NoData or something are both valid)
• scan works? idk how this would function
• can get-heart-rate-log-settings, set-heart-rate-log-settings
• can set-time (this should be safe to do)
• can send raw command (maybe to verify that battery works?)

Don't need to do all of this in one PR