* Add VAD models
* Extract function to normalize model path from ruby_whisper_initialize()
* Define ruby_whisper_vad_params struct
* Add VAD-related features to Whisper::Params
* Add tests for VAD-related features
* Define Whisper::VADParams
* Add Whisper::VAD::Params attributes
* Add test suite for VAD::Params
* Make older test to follow namespace change
* Add test for transcription with VAD
* Add assertion for test_vad_params
* Add signatures for VAD-related methods
* Define VAD::Params#==
* Add test for VAD::Params#==
* Fix Params#vad_params
* Add test for Params#vad_params
* Fix signature of Params#vad_params
* Use macro to define VAD::Params params
* Define VAD::Params#initialize
* Add tests for VAD::Params#initialize
* Add signature for VAD::Params.new
* Add documentation on VAD in README
* Wrap register_callbask in prepare_transcription for clear meanings
* Set whisper_params.vad_params just before transcription
* Don't touch NULL
* Define ruby_whisper_params_type
* Use TypedData_XXX for ruby_whisper_params instead of Data_XXX
* Remove unused functions
* Define rb_whisper_model_data_type
* Use TypedData_XXX for ruby_whisper_model instead of Data_XXX
* Define ruby_whisper_segment_type
* Use TypedData_XXX for ruby_whisper_segment instead of Data_XXX
* Define ruby_whisper_type
* Use TypedData_XXX for ruby_whisper instead of Data_XXX
* Qualify with const
