[RFC] add class support in bc-linter

[zhewenl]

as discussed with @izaitsevfb, we want to also include linter checks on classes in addition to public functions; but prior to landing this PR, we need to create some rules template for linters, where we can define what to check(or not).
Like:

pytorch:
- Files: global
- Include: functions

vLLM:
- Files: vllm/v1/attrition, vllm/v1/core
- Include, classes, functions

cc @huydhn @yangw-dev @houseroad

[vercel]

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