Dart API for speaker diarization #1403

Job	Run time
ubuntu-20.04 3.10 transducer	7m 41s
ubuntu-20.04 3.10 paraformer	8m 16s
ubuntu-20.04 3.10 zipformer2-ctc	7m 34s
ubuntu-22.04 3.10 transducer	4m 28s
ubuntu-22.04 3.10 paraformer	5m 25s
ubuntu-22.04 3.10 zipformer2-ctc	4m 44s
windows-latest 3.10 transducer	17m 17s
windows-latest 3.10 paraformer	20m 41s
windows-latest 3.10 zipformer2-ctc	17m 8s
macos-latest 3.10 transducer	5m 34s
macos-latest 3.10 paraformer	10m 9s
macos-latest 3.10 zipformer2-ctc	5m 22s
macos-14 3.10 transducer	3m 32s
macos-14 3.10 paraformer	4m 13s
macos-14 3.10 zipformer2-ctc	4m 33s
	2h 6m 37s

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