Support system search by dataset name

[pfliu-nlp]

So far, Explainaboard web supports searching systems based on dataset split, tasks, system_name, it would be nice if users could search based on the dataset name

[lyuyangh]

This would be very useful! Kind of related to this, I think we may need to redesign the search/filter bar so it fits more options. Maybe, the GitHub filtering UI can be a reference. Though, I think our current design is more intuitive.

[pfliu-nlp]

Thanks, @lyuyangh . The GitHub-style filter bar looks pretty good!