Stats for audio
~~i will maybe create a separate worker for media features (audio and image), haven't decided yet~~

In the end I didn't create a new worker / a new level (feature-type) because it's still not needed for our datasets sizes, see https://github.com/huggingface/datasets-server/pull/2612#issuecomment-2015482880

Failed e2e tests build seem to be unrelated to this PR (weird though).


**didn't i forget anything?**
Stats for audio: ~~i will maybe create a separate worker for media features (audio and image), haven't decided yet~~

In the end I didn't create a new worker / a new level (feature-type) because it's still not needed for our datasets sizes, see https://github.com/huggingface/datasets-server/pull/2612#issuecomment-2015482880

Failed e2e tests build seem to be unrelated to this PR (weird though).


**didn't i forget anything?**