[Feat]: Improved persistence API

[widavies]

It is tedious to create a RIOModel for every type that needs to get serialized to the database. A RIOModel for mobile requires a column for each top level field in the model within SQLite. This is very error prone - forgetting to update these when adding a new field is likely. Secondly, some fields can be disabled during shallow loads. A much cleaner solution here is an annotation for the class (like "@RIOPersistable") that will handle mapping all fields into database columns, and another field-level annotation for ("Shallow") meaning the field won't be loaded during a shallow load (or something like that).

A second, less-important issue is that IDs are a little messy as well. Maybe each model should inherit from a superclass or something.

[github-actions]

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