Add support for AMR eMUCS-A1 – V5.0.1 DSMR messages

[MagMeister]

Describe the problem you have/What new integration you would like

The A1 port of the industrial meter has the same physical interface as the P1 port of the residential meter, but the telegrams are different. Request to support these telegrams side by side.

Please describe your use case for this integration and alternatives you've tried:

Readout DSMR values in common with the P1 standard, but also include the values specifically related to the A1 standard. Handle the differences in the parser.

Additional context

Specification:
AMR eMUCS-A1_E.5.0-1.pdf