chore: move playground (#33260)

apps/uikit-playground/.eslintignore

apps/uikit-playground/.eslintrc.cjs

apps/uikit-playground/.gitignore

apps/uikit-playground/.prettierrc

apps/uikit-playground/CHANGELOG.md

apps/uikit-playground/index.html

apps/uikit-playground/package.json

apps/uikit-playground/postcss.config.js

apps/uikit-playground/public/vite.svg

apps/uikit-playground/src/App.css

apps/uikit-playground/src/App.tsx

...ikit-playground/src/Components/CodeEditor/BlockEditor.tsx

...ground/src/Components/CodeEditor/Extensions/Extensions.ts

...nd/src/Components/CodeEditor/Extensions/HighlightStyle.ts

...ground/src/Components/CodeEditor/Extensions/basicSetup.ts

...-playground/src/Components/CodeEditor/Extensions/index.ts

...ground/src/Components/CodeEditor/Extensions/jsonLinter.ts

...und/src/Components/CodeEditor/Extensions/payloadLinter.ts

...-playground/src/Components/CodeEditor/Extensions/theme.ts

...ikit-playground/src/Components/CodeEditor/Parser/index.ts