Catch and re-raise any/all `Event loop is closed` exceptions

[tsmith023]

Currently if a RuntimeError("Event loop is closed") is raised, the user observes a potentially cryptic error and stacktrace. We should instead catch and re-raise such an exception with a better description to improve the UX

[gssakash]

I would like to take on this issue if it's available.

[tsmith023]

Closing because the client no longer uses a custom event loop to run async requests in the sync client