* whisper.cpp: impl dtw algo
* WIP: producing and placing DTW timestamps on tokens
* Fix compile and assertion errors. Attempt to DTW timestamp with single_segment=false.
* Fix mistake causing incorrect alignment of dtw timestamps
* implement N_TOP_MOST and CUSTOM alignment heads setting
* whisper: fix typo on alignment heads enum
* Fix issues related to changes in whisper.cpp
* Fixed excessive memory use when using DTW timestamps. Other minor fixes to DTW timestamping function
* decoder: save cross QKs only if requested
* Calling median filter with ggml_map_custom1
* Reimpl aheads n_top_most and custom. Sanity checks on chosen aheads
* Copying cross QKs from decoder backend correctly
* dtw: cleanup
* Fix incorrect n_frames passed to dtw when near end of audio
* Fix aheads_masks_init for backend != CPU
* whisper : minor style
* main : add dtw (wip)
* whisper: fix invalid memory access in aheads_masks_init
* main : add dtw (cont)
* whisper : minor
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
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