Make I2C sensor messages more generic, reduce maintenance overhead

[brentru]

Breaking PR for both client and device Idea: Remove SENSORNAMEUpdateRequest sub-messages to be more generic and avoid adding to the size of this file every time we'd like to add a sensor. Users adding a sensor to the future component definition JSON repo should not need to also update i2c.proto.

Changes:

• New Field, i2c_device_name should match the sensor's name from the JSON list.
• New message I2CDeviceSensorProperties holds the i2c device's sensor type and period. The period should be set to 0.0 if the sensor is not enabled in the modal.
  • I2C devices may have multiple sensors, this field may be repeated.
• Removed sensor-specific UpdateRequest messages in favor of new scheme.

[brentru]

Did a small pass over this before we start integrating next week.

[brentru]

@lorennorman I changed sensor_period to a uint32 type, is this OK from your side?