Make separate class for each analysis type

[ka-sarthak]

• [x] Make a separate class for each analysis type. This way the type of the analysis within a given eln will always be fixed.

_Originally posted by @ka-sarthak in https://github.com/FAIRmat-NFDI/AreaA-data_modeling_and_schemas/issues/92#issuecomment-1888563927_