feat: add chlorinator diagnostics

[kmbulebu]

Adds requests for salt cell chlorinator measurements and relay polarity.

Parse cell voltage, current, cell and board temperatures, and instant and average salt levels while preserving the raw controller values.

Tested against my pool setup.

measurement = await api.async_get_chlorinator_measurement(
      pool_id=7,
      chlorinator_id=8,
  )

  print(f"Cell voltage: {measurement.voltage:.2f} V")
  print(f"Cell current: {measurement.current:.2f} A")
  print(f"Cell temperature: {measurement.cell_temperature_f:.1f} °F")
  print(f"Board temperature: {measurement.board_temperature_f:.1f} °F")
  print(f"Instant salt: {measurement.instant_salt_level} ppm")
  print(f"Average salt: {measurement.average_salt_level} ppm")

  polarity = await api.async_get_chlorinator_relay_polarity(
      pool_id=7,
      chlorinator_id=8,
  )

  print(f"Relay polarity: {polarity.relay_setting}")

Sample with chlorinator on:

  Cell voltage: 31.64 V
  Cell current: 0.36 A
  Cell temperature: 85.4 °F
  Board temperature: 119.5 °F
  Instant salt: 2869 ppm
  Average salt: 2936 ppm
  Relay polarity: 1

Sample with chlorinator off:

  Cell voltage: 0.00 V
  Cell current: 0.00 A
  Cell temperature: 0.0 °F
  Board temperature: 0.0 °F
  Instant salt: 0 ppm
  Average salt: 2900 ppm

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud