Refreshed Asset pages for projects and datasets

With the release of the Asset page side-nav a couple months ago, users can now access Asset pages for projects and datasets. These pages were pretty sparse.

We’ve reformatted them to look cleaner, and added a tabular view to browse the tables within. This shows the tables' Importance Score, reads/write per day, and count of distinct users, helping users understand which tables are heavily used, and which aren't.