test_cancel_request enables context shift so the generation only ends
when the request is cancelled, then polls /slots with a deadline.
Without context shift the generation fills the context and frees the
slot on its own on fast machines, so the test passes even with
cancellation disabled.
test_server_sleep uses the existing wait_for_sleep helper instead of a
fixed sleep.
* implement sleeping at queue level
* implement server-context suspend
* add test
* add docs
* optimization: add fast path
* make sure to free llama_init
* nits
* fix use-after-free
* allow /models to be accessed during sleeping, fix use-after-free
* don't allow accessing /models during sleep, it is not thread-safe
* fix data race on accessing props and model_meta
* small clean up
* trailing whitespace
* rm outdated comments
Pascal
Will
Xuan-Son Nguyen