Eclipse Java Compiler issues fixed

[sbespalov]

Description

This PR fixes Eclipse Java Compiller (ejc) issues:

• Generic type determination fixed by specifying the type parameter
• this reference within closure anonymous class as parameter of super constructor invocation fixed by replacing the anonymous function with dedicated class

Below is the list of classes with EJC errors that was fixed:

• CachingClusteredClientBenchmark

Cannot infer type arguments for FluentQueryRunnerBuilder<>

• AsyncQueryForwardingServlet

The method makeRequestMetrics(GenericQueryMetricsFactory, QueryToolChest<T,Query>, Query, String) in the type DruidMetrics is not applicable for the arguments (GenericQueryMetricsFactory, QueryToolChest<capture#1-of ?,capture#2-of ?>, Query, String)

• DruidCoordinator

Cannot refer to 'this' nor 'super' while explicitly invoking a constructor

This PR has:

• been self-reviewed.
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths.
• added integration tests.
• been tested in a test Druid cluster.

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Key changed/added classes in this PR

• DruidCoordinatorSegmentReplicantLookupConsumer

[sbespalov]

Closed because of failed integration tests. New #8818 opened.