Fix #222: Prompt functions hang in editor commands #230
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This change fixes an issue where $host.UI prompt functions do not return
the user's response when run inside of PowerShell editor commands. This
was caused by the HandleInvokeExtensionCommand method returning a Task
that did not complete until after the command completed. The fix was to
not await on completion of the command so that the prompt response has a
chance to come through.
This change is