feature: migrate rupture rate filtered functions from solvis-graphql-api

[chrisbc]

This is part one of epic #30

done when:

• [x] migrate cached.get_rupture_ids_for_location_radius function
• [x] migrate cached.get_rupture_ids_for_fault_names
• [x] modify filtering args to use simple python enum
• [x] add unit test coverage and docstrings for above

NB given that this filtering logic can be applied to any dataframe returning rupture information consider refactoring to make this more generalised (maybe a new ticket, but lets think about it now).

[DrCuriosity]

@chrisbc, just to be clear on where we're putting these functions: I'm guessing in InversionSolutionOperations?

There are a couple of get_ruptures_... functions there already, so it seems like a good fit.

I'm also wondering if it might be good to rename those existing functions to get_rupture_ids_... so that they're more consistently and explicitly named? If I do that, I'll be passing the original method names through to the renamed methods with a DeprecationWarning, so that things keep working but anyone depending on the old names can clean things up more easily.