update linter to support `_id` in variable names and kebab-case in path

[toumorokoshi]

The AEPs are currently being updated to support snake_case with _id fields: aep-dev/aeps#321

Updating aepc to use this new schema raises proto errors. specifically the current errors are:

example/bookstore/v1/bookstore.proto:375:3:Resource pattern "stores/{store_id}" must alternate between collection and identifier. "{store_id}" is not an identifier (buf-plugin-aep)
example/bookstore/v1/bookstore.proto:375:3:Variable names should omit the `_id` suffix, such as "stores/{store}". (buf-plugin-aep)
example/bookstore/v1/bookstore.proto:375:3:Resource patterns must use kebab-case for collection identifiers. (buf-plugin-aep)