ruby : bug fix on callbacks and no_speech_prob (#2656)

ruby : Add no_speech_thold (#2641)

ruby : Sync whisper.cpp and model download feature (#2617)

ruby : Add low-level methods to transcribe (#2585)

ruby : extend API (#2551)

ruby : fix the instructions (#2548)

ruby : add more APIs (#2518)

ruby : support new-segment callback (#2506)