Fix event loop binding

[x42005e1f]

What do these changes do?

In a multithreaded environment, it is possible that nowait methods may be called in event loops other than the one in which asynchronous methods are called. As a result, simultaneous binding to two different event loops is possible, because of which some methods will not work. This PR fixes this bug and ensures that RuntimeError is safely raised.

Side effect: nowait methods no longer depend on the event loop (and do not raise a RuntimeError when used from a different event loop).

Are there changes in behavior for the user?

There are no behavior changes for users.

[codspeed-hq]

CodSpeed Performance Report

Merging #727 will not alter performance

_{Comparing x42005e1f:fix-event-loop-binding (dff6070) with master (8ab8405)}

Summary

✅ 4 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.40%. Comparing base (8ab8405) to head (dff6070).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #727      +/-   ##
==========================================
- Coverage   95.40%   95.40%   -0.01%     
==========================================
  Files           5        5              
  Lines        1721     1719       -2     
  Branches      154      154              
==========================================
- Hits         1642     1640       -2     
  Misses         52       52              
  Partials       27       27              

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