[CuteTests] Waiting on other fibers

1. Automate community
2. Tutorials & Examples

Payment status: Non-Premium
Tech-savvy level: Quite savvy
Description:
Just a tech demo on how to make a "fiber wait lock", since concurrency often needs a way to make one "thread" wait on another to continue.
Whenever you see "thread-safe", that should mean multiple threads should be fine using the object at the same time.