Rfxtrx Sensor Alias

Feature Requests
1

RFXTRX 433mhz sensors may change their ID on battery change.
Therefore it will create another undesired sensor automatically when I really want just to keep all data in the same name & Database.
rflink has a nice implementation where it’s allowing aliases for a sensor: rflink #alias

The request is: Implement alias function for rfxtrx as it is done in rflink.

I’m thinking an updated implementation could be something similar:

- platform: rfxtrx
  automatic_add: true
  devices:
    0a520d01670100b1280179:
      name: 'Loftet'
      data_type:
        - Humidity
        - Temperature
      alias:
        - 0a520d00b00100d2330189
        - 0a520d02b00100d1320189
        - 0a520d6ffa0100cb200259