Enable Serialization on WorkflowQueue

Is your feature request related to a problem? Please describe.
Java-SDK
In the following community thread.
https://community.temporal.io/t/workflow-await-does-it-release-thread/252
To continually process events on a specific entity in the order we received the events, we can use WorkflowQueue. To implement this solution, we need WorkflowQueue to be serializable. At this time we can not use this technique as the WorkflowQueue is not implementing Serializable. The main purpose of this technique is to avoid long running workflows.

Describe the solution you'd like
Enable Serialization on WorkflowQueue

Describe alternatives you've considered
Using Java Queue for now

Additional context
I received the above details from @maxim in one of my conversation in slack channel. Creating this ticket to make sure this requirement is addressed as part of the future releases.

Created from https://github.com/temporalio/temporal/issues/792

Start by locating WorkflowQueue in the Java SDK and reviewing the SDK's existing serialization conventions. Add focused tests showing that a WorkflowQueue can be serialized and restored while preserving event order; the work is done when those tests pass.