* 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
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