Fix that a process resumed through callback would not broadcast events

[torkashvand]

• Add broadcast_func to continue_awaiting_process_endpoint so that when using ThreadPool executor, processes resumed through callback URL will broadcast events

Closes #744

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.56%. Comparing base (b4eb53d) to head (a31754a). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #756 +/- ## ======================================= Coverage 83.55% 83.56% ======================================= Files 189 189 Lines 9391 9392 +1 Branches 1543 1543 ======================================= + Hits 7847 7848 +1 Misses 1277 1277 Partials 267 267 ```

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