Updated playground

[piotrpospiech]

• Updated Zod playground with custom uniforms props. Added custom label, placeholder and radio component.
• Increased autosave delay. With lower value, it caused issues with writing schema if it was invalid (so after every letter if schema wasn't completed or it was wrong, textarea loses focus)
• Fixed displaying undefined instead of null. JSON.stringify by default converts undefined to null.
• Formatted playground presets

Future work

Add more variations of fields for example multiselect checkboxes:

[codecov[bot]]

Codecov Report

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

Project coverage is 95.05%. Comparing base (2a116fb) to head (71c4abb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1353 +/- ## ======================================= Coverage 95.05% 95.05% ======================================= Files 175 175 Lines 2892 2892 Branches 763 763 ======================================= Hits 2749 2749 Misses 59 59 Partials 84 84 ```

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