CompletableFuture module for completeAsync

[kanderson250]

Description

From this spike #1741.

Spring 6 methods wrapped in a CompletableFuture and annotated with @Async don't hit our current instrumentation. This is because they call completeAsync on the CF, which was introduced with Java 9 and so isn't a part of our current modules for Java 8+.

Instrumenting completeAsync will entail creating a new CompletableFuture instrumentation module, applicable to JDK 9+.

Acceptance Criteria

Async calls made with Spring 6 are instrumented fully, and additional tests are added for completeAsync.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-265095

[kanderson250]

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