jack: Add low-latency property for automatic latency-optimized setting
Similar to wasapi/wasapi2 plugins on Windows, adding low-latency option so that jack element can optimize GstAudioRingBufferSpec setting for low latency.
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Similar to wasapi/wasapi2 plugins on Windows, adding low-latency option so that jack element can optimize GstAudioRingBufferSpec setting for low latency.