Aggregate deal stats on the Storage Deals page

It would be nice to see aggregated deal stats on the deals page, something like

```
Ready To Publish: 18
Awaiting Publish Confirmation: 30
Transferring: 80
Sealer: PreCommit1: 64
```

With the list ideally being clickable to quickly filter the list to see deals in potentially weird states quickly.

Start at the Storage Deals page and trace how the deal list is loaded and filtered. Add aggregate counts for the listed deal states, make each count clickable to filter the list, and verify that unusual states can be found quickly.

Written by the indexing model from the issue text.