Add sensor-config commands (guidance needed)

[oscgonfer]

This is a pull request to add sensor configuration commands for the new sensors implemented in the Air Quality module and which available configs are in the admin.proto already: https://github.com/meshtastic/protobufs/blob/master/meshtastic/admin.proto#L644-L654

Support / guidance needed parts

1. I have the feeling that I am doing something wrong while parsing the options, as I assume there must be some sort of better option than manually typing all of them... (see https://github.com/fablabbcn/meshtastic-python/blob/b54ac0e0f0aaee60c5a54069e47bbb6c7818447a/meshtastic/node.py#L980-L1021)

2. Reaching local node works, but remote nodes doesn't:

An example of what I am doing to test this is:

meshtastic --sensor-config scd4x_config.factory_reset true --host 192.168.1.136

Which successfully reaches the node and gets processed via admin command when the target node is directly on that IP address. That node also has MQTT enabled, which also gives me some info:

However, when targeting another node on that mesh:

meshtastic --sensor-config scd4x_config.set_asc true --host 192.168.1.133 --dest \!ae608d98

I don't manage to make these admin commands to reach the dest, getting the following the MQTT feedback:

decoded {
  portnum: ADMIN_APP
  payload: "sensor_config {   scd4x_config {     set_asc: true   } }"
  want_response: true
}
---
decode_mp
from: 2925563288
to: 3665040172
decoded {
  portnum: ROUTING_APP
  payload: "error_reason: NO_CHANNEL"
  request_id: 4008839238
  bitfield: 1
}