Add ClosableShareConsumer (KIP-932)

[k-wall]

Is your feature request related to a problem? Please describe.

https://cwiki.apache.org/confluence/display/KAFKA/KIP-932%3A+Queues+for+Kafka#KIP932:QueuesforKafka-Fetchingandacknowledgingrecords is adding a ShareConsumer API to the Kafka Client. This project already has Closable* wrappers around Admin, Consumer and Producer which give #close a sensible close timeout.

It may wish to add a similar wrapper around ShareConsumer in order to keep the symmetry. It will support the test cases around share consumers.

KIP-932 is still partly implemented in 3.9, but it is marked unstable.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.