Use inferred member variable dictionary to create partition_info

[delucchi-cmu]

Bug report

Currently, we create a dictionary for each InputReader type, that pulls in values from member variables.

We should, instead, automagically create a dictionary of parameter values from the object's members. This might only be feasible within dataclasses, but it might also work with plain-old-python-objects.

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• [ ] I have described the situation in which the bug arose, including what code was executed, information about my environment, and any applicable data others will need to reproduce the problem.
• [ ] I have included available evidence of the unexpected behavior (including error messages, screenshots, and/or plots) as well as a descriprion of what I expected instead.
• [ ] If I have a solution in mind, I have provided an explanation and/or pseudocode and/or task list.

[delucchi-cmu]

Current code can cause errors when subclassing an existing input reader, but not accepting/initializing all expected super-class attributes in the sub-class.