Support WipperSnapper API V2

[brentru]

Adafruit WipperSnapper Arduino should support the WipperSnapper API V2.

WipperSnapper API V2 aims to address (Related: adafruit/Wippersnapper_Protobuf#133):

• Enforce consistent naming of messages and fields
• Reduce the amount of MQTT topics utilized by WipperSnapper from >25 to 1 bi-directional topic, signal
• Implement a unified sensor API, sensor.proto
• Refactor pin.proto into analogio.proto and analogio.proto
• Possible: Move to period-per-component (vs -per-sensor)
• Other changes are possible as we narrow down the scope and make changes.

[brentru]

Closing in favor of the more actionable issue, #613