FIX: Dataset passed to every single check

[unichronic]

This fixes #1080

Changes:

Refactored the code to remove the boilerplate of passing the dataset to every check method while maintaining the same functionality. The dataset is now accessible via the instance variable self.ds in all check methods.

[benjwadams]

Nice start. Unfortunately all checker subclasses use the (self, ds) function parameters as the calling convention as well. For example
https://github.com/ioos/compliance-checker/blob/main/compliance_checker/cf/cf_1_6.py#L633 along with all the other check_* methods in that module as well as others.

There's no easy way to do this without breaking other potential third party checkers. Including @ocefpaf for input here. I think at some level we'll need to keep the ds for now but refer to something like self.ds within the methods, possibly using some magic in the methods to check the value of ds and include a deprecation warning once per checker run with checkers that still use the old calling convention.

[ocefpaf]

Indeed a deprecation warning and some testing against existing plugins would be nice. I do know that we have at least two plugins that are not in our CIs https://github.com/euro-cordex/cc-plugin-cc6 and https://github.com/uw-farlab/cc-plugin-og