CP-3163 Store StackTrace when Action is called for easier debugging and tracing

[patkujawa-wf]

It's hard to trace the flow of async, event-oriented code. One thing that I've found that helps is passing along the stacktrace of the caller. The listener can then access and print that (e.g. from a property on the Action) to see exactly how the Action came to be called.

Thoughts?

[rmconsole2-wf]

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