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

[ryantwolf]

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.