INA3221 sensor: use for bus voltage & environment metrics (#4215)

* use INA3221 for bus voltage; fixes for telemetry variants

- add to sensors available for environment telemetry
  (to report voltage/current)
- add vars to define channels to use for battery voltage
  (for getBusVoltage) and environment metrics (default
  to CH1 for both)
- write to the correct fields on the measurement struct
  depending on the measurement variant, and DRY up the
  sensor measurement collection code a bit
- this might be suitable for a common implementation for
  the INA* sensors in a future PR...

* formatting

* derp

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/Power.cpp

@@ -449,6 +449,11 @@ class AnalogBatteryLevel : public HasBatteryLevel
             if (!ina260Sensor.isInitialized())
                 return ina260Sensor.runOnce() > 0;
             return ina260Sensor.isRunning();
+        } else if (nodeTelemetrySensorsMap[meshtastic_TelemetrySensorType_INA3221].first ==
+                   config.power.device_battery_ina_address) {
+            if (!ina3221Sensor.isInitialized())
+                return ina3221Sensor.runOnce() > 0;
+            return ina3221Sensor.isRunning();
         }
         return false;
     }