Feature: Allow to point to custom checkstyle config to use during hook execution

[rgraue]

As a developer I want to create a custom config in my repo that this hook automatically searches for and uses as the config passed to checkstyle.

Acceptance Criteria

I can either create a custom .checkstyle_config.xml file in the root level of the repo which gets automatically detected or passed as an argument in the .pre-commit-config.yaml file.

i.e:

--config [-c] path/to/file/.checkstyle_config.xml