Making Enqueue Azure a Spring Boot Application

This merge request addresses issue #6 (closed). It contains code changes and devops/azure/charts changes to deploy indexer-queue as a spring boot application. Performance Testing results can be found here - https://dev.azure.com/osdu-demo/osdu-perf/_wiki/wikis/osdu-perf.wiki/398/Run-4

Implementation Details

• Uses the Azure Client Library for Java to receive messages from service bus topics
• Uses Partition Service to fetch service bus connection information for each data partition
• Implements DpsHeaders as Thread Scoped beans instead of request scoped beans. This is because indexer queue is a worker service with no public APIs so there is no context of request scope.
• Deleted file log4J2.xml as it is now directly pulled from core-lib-azure.

Testing

• Perf tested.
• Integration and unit tested.
• Pipelines green.