* feat: Add search capability to api keys
* feat: Add support for searching to currency and customer endpoints
* fix: Clean up product search filters
* feat: Add search support to regions
* feat: Add search support to sales channels
* feat: Add search support to store module
* feat: Add search support to user module
* fix: Clean up inventory search
* feat: Add search support for payments
* fix: Add searchable attributes to stock location models
* feat: Add search support to tax
* feat: Add search support to promotions
* feat: Add search support for pricing, filtering cleanup
* fix: Further cleanups around search
What
- Add link between API key and sales channels
- Add API route for batch adding sales channels to a publishable API key
- Clean up API key API routes responses
- Move API key test suite from `integration-tests/modules` to `integration-tests/api`