Make comment checker to be polymorphic

The comment checker in the hook currently only detects Python code, but it needs to support various languages.

Look for whether Python has a library that can detect this (finding comments via static analysis)

Or if it can't be done in Python, look for examples of whether other languages have something (wouldn't something like ast-grep work?)

If possible, it should be changed to an approach that supports this polymorphically

Start by locating the hook's current Python-only comment checker and document how it detects comments. Investigate Python static-analysis libraries and the ast-grep approach for supporting multiple languages. Done means the checker uses a polymorphic approach that can detect comments across the required languages, with its supported scope documented.

Written by the indexing model from the issue text.