Need a mechanism for targeting suppressions at groups of types

In the AIP scenario, The types from the OAI spec are brought into the AIP spec, transformations are added, and new APIs in a new namespace are added - some linting rules *should* apply to the new APIs, but should be suppressed in the core OAI types.

Some options for allowing this:
- Allow suppressions on a namespace impacted all contained types
- Allow suppressions on a per file or directory basis
- Create / provide guidance for creating a tool to add point suppressions to a spec

Start by examining the AIP scenario described in the issue and how linting rules currently distinguish imported OAI types from new APIs. Compare namespace, file or directory, and generated point-suppression approaches. Done means a documented, agreed mechanism or guidance for targeting suppressions at groups of types.

Written by the indexing model from the issue text.