Add accessibility testing tools

[aednlaxer]

• [x] New example app with code comments for some issues
• [x] Testing tools panel
• [x] Option to control logging level (verbose, warnings, none)
• [x] README updates
• [x] Verify changes with the designer
• [x] Fix design notes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (b967a7d) to head (f40563b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #46 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 9 18 +9 Lines 349 632 +283 ========================================== + Hits 349 632 +283 ```

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