Make the list of fields in a response configurable

[devraj]

Is your feature request related to a problem? Please describe.
Many of the endpoints allow providing a list of fields to the request, which varies the size of the response payload (see alarms). We should support this as part of the API calls.

Describe the solution you'd like
At the moment the pyndatic models expect all of the fields to exists, we will have to study how to temporarily relax the validation requirements of pydantic models. I would rather not have to duplicate the models for the two use cases.

Provide a pythonic manner to provide the list of fields (rather than strings), again we might have to lean into the pydantic models and how they make the meta data available to the application.

Describe alternatives you've considered
NA

Additional context
NA