feat: ✨ add check error matcher

[martonvago]

Description

This PR adds a CheckErrorMatcher object. This is/will be used to filter out unwanted errors easily.
Example usage:

errors = exclude_errors(
        errors,
        [
            CheckErrorMatcher(validator="required", json_path="data"),
            CheckErrorMatcher(validator="type", json_path="path", message="not of type 'array'"),
        ],
    )

I'm going to use this to replace the check_required flag in Sprout's check functions.

Closes #

This PR needs an in-depth review.

Checklist

• Added or updated tests
• Updated documentation
• Ran just run-all

[martonvago]

This is a very simple class for encapsulating matching logic. The motivation behind this is that filtering CheckErrors or deciding if a CheckError fulfills any of a set of conditions comes up pretty often.

[martonvago]

I put this class and exclude_errors.py into checks because they are generally applicable, but we can move them to sprout_checks if we think they should be restricted to Sprout.

[martonvago]

This can obviously be refined further (e.g. to allow matching fields with a specific name on resources only), but we can add that as/if we need it. Same goes for message_matches.