fix(testing-sdk): support PENDING status reinvocation and execution failure #397
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Issue #, if available:
#384
Description of changes:
When the client (language SDK) has stale data, it should be reinvoked if it exited without knowing the latest state of the checkpoint API. This is how the actual service works, and so it should be implemented in the testing library as well. This also fixes an issue where the language SDK exits at the same time that a callback completes, and hangs forever/throws an error. It will now re-invoke in this case.
Additionally, the testing SDK will now throw an error when the language SDK returns PENDING with no outstanding pending operations, timers, or stale data. This will fix the issue where it would hang forever when this happened.
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