Add speech processing tasks
Are there any `task_categories:automatic-speech-recognition` dataset for which we should update the tags ? > Are there any `task_categories:automatic-speech-recognition` dataset for which we should update the tags ?

Yes there's a few - I'll fix them tomorrow :)
This PR replaces the `automatic-speech-recognition` task category with a broader `speech-processing` category. 

The tasks associated with this category are derived from the [SUPERB benchmark](https://arxiv.org/abs/2105.01051), and ASR is included in this set.