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This PR reworks the
AudioData.get_value()backend to lazily fetch/resample data.Before that, the hwole value of each AudioItem was fetched before being downsampled.
Now, the AudioItem data is streamed (seamlessly across items) and resampled on the go, so that the RAM usage is optimized.
I still have to work on the MSEED backend and to add some specific tests (e.g. I have to ensure that the resampler behaves nicely when consecutive AudioItems have different input sample rates)