chore: Add radio example

[AlexMunoz]

Add radio example #939

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Codecov Report

Merging #941 (15a500f) into v2 (2f7c6ca) will increase coverage by 2.29%.
The diff coverage is 100.00%.

❗ Current head 15a500f differs from pull request most recent head e27cb9e. Consider uploading reports for the commit e27cb9e to get more accurate results

@@            Coverage Diff             @@
##               v2     #941      +/-   ##
==========================================
+ Coverage   30.80%   33.09%   +2.29%     
==========================================
  Files         143      145       +2     
  Lines        4061     4061              
  Branches     1154     1153       -1     
==========================================
+ Hits         1251     1344      +93     
+ Misses       2809     2716      -93     
  Partials        1        1              

Impacted Files	Coverage Δ
...ges/ariakit/src/radio/__examples__/radio/index.tsx	100.00% <100.00%> (ø)
packages/ariakit/src/dialog/dialog.tsx	53.79% <0.00%> (-6.97%)	⬇️
packages/ariakit/src/combobox/combobox-popover.ts	92.00% <0.00%> (-1.34%)	⬇️
...t/src/button/__examples__/button-as-link/index.tsx	100.00% <0.00%> (ø)
packages/ariakit/src/focusable/focusable.ts	75.42% <0.00%> (+0.57%)	⬆️
packages/ariakit/src/composite/composite.ts	90.37% <0.00%> (+0.74%)	⬆️
packages/ariakit/src/composite/composite-item.tsx	58.06% <0.00%> (+1.07%)	⬆️
packages/ariakit/src/composite/__utils.ts	71.59% <0.00%> (+3.40%)	⬆️
packages/ariakit/src/composite/composite-state.ts	79.79% <0.00%> (+14.14%)	⬆️
packages/ariakit/src/command/command.ts	86.84% <0.00%> (+14.47%)	⬆️
... and 4 more

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[AlexMunoz]

Hello @diegohaz, I'm working on the radio button example, but I am not sure about the tests, could you please take a look at it?

[diegohaz]

@AlexMunoz Tests look good! Great job! 👍

The only thing I'd change would be removing the describe function. With the granularity we already have with the separate examples, there's no need for nested tests.

[diegohaz]

That looks great, @AlexMunoz! Thank you!