server : simplify state machine for slot (#9283)
* server : simplify state machine for slot
* add SLOT_STATE_DONE_PROMPT
* pop_deferred_task
* add missing notify_one
* fix passkey test
* metrics : add n_busy_slots_per_decode
* fix test step
* add test
* maybe fix AddressSanitizer?
* fix deque ?
* missing lock
* pop_deferred_task: also notify
* Update examples/server/server.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
