WIP - Per-input evaluator classes

[drewoldag]

WIP PR

Problem & Solution Description (including issue #)

This addresses issue #14 Initial commit is a scaffolding commit for pdf-vs-pdf evaluator, with a goal to use this as a template for the other types of evaluator classes.

Code Quality

• [ ] My code follows the code style of this project
• [ ] I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• [ ] My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• [ ] Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fd13285) 97.17% compared to head (df3bf80) 97.17%. Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #74 +/- ## ======================================= Coverage 97.17% 97.17% ======================================= Files 32 32 Lines 1736 1736 ======================================= Hits 1687 1687 Misses 49 49 ```

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[eacharles]

This has been merged in #98 , closing this PR