Cleaner pinging

[TheFreal]

Removing pinging from the battery controller and giving it back to the overarching scooter service. Passing on a "ping()" function to all readers to trigger whenever they receive data.

QA checklist

• [x] Read state (state & power state)
• [x] Read primary battery SOC
• [x] Read primary battery cycles
• [x] Read secondary battery SOC
• [x] Read secondary battery cycles
• [x] Read seat closed
• [x] Read handlebar
• [x] Read AUX SOC
• [x] Read CBB SOC
• [x] Read CBB charging state
• [x] Update ping
• [x] SOCs are cached (after app restart)
• [x] Commands can be sent (locking & hibernation)