Refactor modules to be in a single class and dataframe backend checking

[ryantwolf]

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Description

This PR does a couple of things:

• Refactor ScoreFilter and DocumentFilter to be a single module.
• Refactor Modify and DocumentModifier to be a single module.
• Add a generic Module abstract base class that can validate the necessary backend of each module.
• Add a ToBackend module that converts between backends in a pipeline.

Usage

# Add snippet demonstrating usage

Checklist

• [ ] I am familiar with the Contributing Guide.
• [ ] New or Existing tests cover these changes.
• [ ] The documentation is up to date with these changes.