Support for reading Multical 21 water meters

Feature Requests
6

Here is my config for wmbusmeters and HA sensor:

/etc/wmbusmeters.conf

loglevel=normal 
# Remember to change auto here to the device you are going to use in production.
device=rtlwmbus
logtelegrams=true
format=json
meterfiles=/var/lib/wmbusmeters/meter_readings
meterfilesaction=overwrite
logfile=/var/log/wmbusmeters/wmbusmeters.log
# Enable MQTT Support
shell=/usr/bin/mosquitto_pub -h localhost -t wmbusmeters/$METER_ID -m "$METER_JSON"

/etc/wmbusmeters.d/multical21

name=Tapwater
id=<replace_with_your_id>
key=<replace_with_your_key>
driver=multical21

HomeAssistant configuration.yaml snippet:

mqtt:
  sensor:
    - name: "Tapwater total"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      unit_of_measurement: "m³"
      device_class: water
      state_class: total
      value_template: "{{ value_json.total_m3 }}"

    - name: "Tapwater target"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      unit_of_measurement: "m³"
      device_class: water
      state_class: total
      value_template: "{{ value_json.target_m3 }}"
    
    - name: "Tapwater temperature"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      unit_of_measurement: "°C"
      device_class: temperature
      state_class: measurement
      value_template: "{{ value_json.flow_temperature_c }}"

    - name: "Tapwater external temperature"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      unit_of_measurement: "°C"
      device_class: temperature
      state_class: measurement
      value_template: "{{ value_json.external_temperature_c }}"

    - name: "Tapwater time leaking"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      device_class: timestamp
      value_template: "{{ value_json.time_leaking }}"

    - name: "Tapwater time bursting"
      state_topic: "wmbusmeters/<replace_with_your_id>"
      device_class: timestamp  
      value_template: "{{ value_json.time_bursting }}"
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