internal: improve @warp-drive/diagnostic DOM Reporter

[runspired]

While @warp-drive/diagnostic has been able to be dropped in for qunit in three packages now, its DOM reporter is not as feature rich as qunit's.

• [x] add comprehensive readme
• [ ] add to EmberData contributing guide
• [ ] add code-doc comments for all public exports and methods
• [x] display individual results
• [ ] make hide/show passed work
• [x] make hide/shoe individual work
• [x] make url params work
• [ ] render container CSS (make it good and also fast)
• [ ] lightmode css?

Feature Parity work

• [x] make test-rerun work
• [ ] rerun failed tests first

New Feature work

• [x] concurrent mode
• [ ] parallel mode
• [ ] randomized mode
• [ ] memory stats

[runspired]

• add a PerformanceObserver to emit events for the test
• add a Holodeck InteractionEvent Integration to tie network requests into the timeline specific tests
• add enforcement of no uncaught errors