add searchable names function to data_models

[CarsonDavis]

Most models have a variety of possible names which can refer to an object. short_name, long_name, aliases, etc. A user desiring to search for a campaign based on a string will expect to see a result that is matched against any of the valid name fields.

This PR implements a list of possible valid name fields for each model and updates the search function to use these fields in the default search.

PROBLEMS:
Currently, the list of returned results in the queryset is not unique, and adding a .distinct('uuid') constraint seems to massively slow down the application.

[edkeeble]

Can you provide a test case demonstrating non-unique results? I can't replicate it with a quick test:

for c in Campaign.search({"search": "convective processes"}):
    print(c.short_name, c.long_name)

>> CPEX Convective Processes Experiment
>> CPEX-AW Convective Processes Experiment – Aerosols & Winds

Does it occur when multiple fields for the same record match the search criteria?

[edkeeble]

Rather than supporting a list of each possible search field and checking against all fields of each subclass, could we not just override search_fields on the subclasses?

e.g.

class Image(BaseModel):
    ...
    @staticmethod
    def search_fields():
        return ["title"]