Improve Handling of Process Parameters and Defaults about vivarium-core HOT 2 OPEN

Some questions about the alternative @U8NWXD:

1. Is the only required backwards compatibility to support a self.defaults dict and a parameters dict being passed to the Process superclass with super().__init__(parameters)? Anything else?
2. Is the only purpose of having the Process superclass access the subclass locals to save these parameters for serialization?

from vivarium-core.

Regarding #171 (comment):

1. I think we also need to handle of special parameters like time_step and _original_parameters, and we need to be able to access parameters through self.parameters.
2. The Process superclass also performs other operations like handling those special parameters, schema overrides, and merging the provided parameters with the defaults. More broadly though, the Process class adds a layer of indirection into which we can insert code to make changes based on what the user does. For example, we use get_schema() to apply schema overrides on top of what the user specifies in ports_schema().

from vivarium-core.