Add IPendingExecutionRequestState
interface to expose completion state of SingleExecuteProtector
#1447
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For customized SynchronizationContext implementation, knowing whether a pending request has been completed could allow it to remove completed requests. Because JTF requests are potentially sent to multiple queues, including the JTF internal queue, many of those requests can be processed especially inside low priority or delayed queues. For low priority queue, completed tasks showing up for high memory usages. This new contract provides a way to make improvements.
This is only for advanced scenarios, common JTF consumers would not access the request or have chance to use it incorrectly.