Adding logic to generate Bearer token for azure, to be used in Integration Tests

This PR contains following set of changes:

1. Added logic to generate JWT token to be used for integration testing for azure
2. Updated REST api endpoint name to api/schema-service/v1 to make it consistent with gcp
3. Minor fix in the existing provider/azure code where while calling Cosmos DB related apis, cross partition query was disable. Enabling it as it is required by underlying cosmosStore class. Added corresponding UTs.