feat(cli): add telemetry and sensors CLI commands

[drewmccal]

Summary

Adds two read-only CLI commands to the shared CommonCLI, so telemetry can be inspected directly over the serial / admin CLI instead of only over the mesh (companion Request Telemetry). Available on any node with a SensorManager (sensor, repeater, etc.).

• telemetry — queries current telemetry (battery voltage on the SELF channel plus everything querySensors() reports) and prints each channel with its decoded value and unit:

  3 channels
  ch1 Voltage=4.05V
  ch3 Temperature=22.4C
  

• sensors — lists the active telemetry channels as an inventory, without values:

  2 sensors
  ch1 Voltage
  ch3 Temperature
  

Implementation notes

• Lives in CommonCLI.cpp alongside the existing sensor get/set/list commands.
• Decodes the CayenneLPP buffer via the shared LPPReader, and formats floats with StrHelper::ftoa (embedded sprintf("%f") is unreliable).
• Output mirrors the existing sensor list convention: an N items header, one line per entry, capped to the reply buffer with a ... truncation marker.
• Decodes the common environmental types with units (temperature, voltage, humidity, pressure, current, power, altitude, GPS); unknown types are listed by channel without a value.
• telemetry queries querySensors() synchronously, the same as a real telemetry request, so it briefly blocks (e.g. ~750 ms per 1-Wire probe) — expected for a manual command.

Testing

Tested on hardware (RAK4631) and confirmed working: both telemetry and sensors return the expected channels/values over the serial CLI, including battery voltage and a 1-Wire temperature probe. Builds clean for both RAK_4631_sensor and RAK_4631_repeater (the shared-CLI change is verified for non-sensor node types too).

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