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fiber: introduce cord_cancel method

The new method sends an event to the given cord, which makes it stop.
It works only if the cord is running an event loop, either implicitly,
inside the cord_costart() function, or explicitly, by calling ev_run()
directly. If the cord was started with cord_costart(), it cancels
the main fiber. As soon as the main fiber returns, the event loop
running in the cord will be broken and the cord will exit. If the cord
was started with cord_start() and is running the event loop explicitly,
cord_cancel() will send an event to it that will break the event loop
immediately. The function reuses the event introduced for handling
the case when cord_cojoin() is cancelled, see commit 6f8b0b6437eaf
("fiber: make cord_cojoin cancellable").

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