feat(bindings/java): implement async ops to pass AsyncStepsTest #2291
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This closes #1572 since we pass all feature tests. Further improvement and development is still needed but we can declare the issue get resolved.
The approach to avoid
GlobalRef
comes from how Spark handleask
:https://github.com/apache/spark/blob/eeab2e701330f7bc24e9b09ce48925c2c3265aa8/common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java#L341-L343