Abstract representation support for new DMM features

[x] Update serializer and deserializer for devices with DMM channels
[x] Write UTs for DMM channel serialization
[x] Update to the preliminary device JSON schema (should be updated before merging)
[x] Update serializer and deserializer for the sequence using detuning map modulation (not tested so there could be bugs)
[x] Write UTs for sequence serialization and deserialization with detuning map modulation
[x] Update to the final sequence JSON schema

pasqal-io / Pulser