* Update imports
* Implement observables in a few places
* Add tests
* Get all clients working
* Use _destroy
* Address PR feedback
* Address PR feedback
* Address feedback
* Added abstractions for PolicyApiService and PolicyService
* Added implementations for PolicyApiService and PolicyService
* Updated all references to new PolicyApiService and PolicyService
* Deleted old PolicyService abstraction and implementation
* Fixed CLI import path for policy.service
* Fixed main.background.ts policyApiService dependency for policyService
* Updated policy-api.service with the correct imports
* [EC-376] Sorted methods order in PolicyApiService
* [EC-376] Removed unused clearCache method from PolicyService
* [EC-376] Added upsert method to PolicyService
* [EC-376] PolicyApiService putPolicy method now upserts data to PolicyService
