chore: Add combobox-matches example

[diegohaz]

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[codecov]

Codecov Report

Merging #953 (b1823bf) into v2 (a668ddb) will increase coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##               v2     #953      +/-   ##
==========================================
+ Coverage   38.51%   38.89%   +0.37%     
==========================================
  Files         149      150       +1     
  Lines        4071     4078       +7     
  Branches     1153     1156       +3     
==========================================
+ Hits         1568     1586      +18     
+ Misses       2502     2491      -11     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/ariakit/src/composite/composite-item.tsx	57.83% <ø> (-0.23%)	⬇️
...c/combobox/__examples__/combobox-matches/index.tsx	100.00% <100.00%> (ø)
packages/ariakit/src/combobox/combobox-state.ts	98.14% <100.00%> (+11.35%)	⬆️
...t/src/dialog/__utils/use-focus-on-child-unmount.ts	92.85% <0.00%> (+35.71%)	⬆️

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