Refactoring indexer event processing, events unbounded from request scope

NOTICE

provider/indexer-gcp/docs/anthos/README.md

provider/indexer-gcp/docs/gcp/README.md

provider/indexer-gcp/pom.xml

...ava/org/opengroup/osdu/indexer/IndexerGcpApplication.java

...n/java/org/opengroup/osdu/indexer/ServletInitializer.java

...roup/osdu/indexer/provider/gcp/IndexerGcpApplication.java

...du/indexer/provider/gcp/common/cache/AttributesCache.java

...er/provider/gcp/common/cache/ElasticCredentialsCache.java

...up/osdu/indexer/provider/gcp/common/cache/IndexCache.java

...roup/osdu/indexer/provider/gcp/common/cache/JwtCache.java

...up/osdu/indexer/provider/gcp/common/cache/KindsCache.java

...p/osdu/indexer/provider/gcp/common/cache/SchemaCache.java

...u/indexer/provider/gcp/common/di/ElasticSearchConfig.java

...r/gcp/common/di/ElasticSearchConfigurationProperties.java

...xer/provider/gcp/common/di/EntitlementsClientFactory.java

...ngroup/osdu/indexer/provider/gcp/common/package-info.java

...rovider/gcp/common/publish/ReprocessingTaskPublisher.java

...exer/provider/gcp/common/publish/StatusPublisherImpl.java

...vider/gcp/common/util/ServiceAccountJwtGcpClientImpl.java