R1:7dabc21154f9

Load all keys, support unique keys, and provide an "all issues" view

Summary:
Ref T1191. Three parts:

- The old way of getting key information only got primary / unique / foreign keys, not all keys. Use `SHOW INDEXES` to get all keys instead.
- Track key uniqueness and raise warnings about it.
- Add a new "all issues" view to show an expanded, flat view of all issues. This is just an easier way to get a list so you don't have to dig around in the hierarchical view.

Test Plan:
{F206351}

{F206352}…