ruby : add VAD speech segments API (#3931)

ruby : add VAD speech segments API (#3931)

* Bump version

* Add test for VAD segments API

* Implement VAD segments API

* Add signatures of VAD segments API

* Stop to dependent on mutex_m

* Check segment range for vad_segment_t0/t1

* Remove needless check

* Remove dead codes

* Fix index check for VAD segments

* Remove needless line

* Use NUM2DBL instead of RFLOAT_VALUE for safety

* Fix document

* Check type of samples

* Arrange CMake cache notation for older version

* Remove unnecessary line break

* Check return value of whisper_vad_segments_from_samples

* Fix type of VAD::Segment#start_time and #end_time

* Prevent dangling pointer from Params to VAD::Params

* Fix typos

* Update README

* Make test follow fix of impl

* Use segments_from_samples_body in ruby_whisper_vad_detect

* Run segments_from_samples without GVL

* Remove unnecessary codes

* [skip ci]Remove trailing whitespace

Co-authored-by: Daniel Bevenius <redacted>
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Co-authored-by: Daniel Bevenius <redacted>