chore: Add combobox-multiselect example

[diegohaz]

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[codecov]

Codecov Report

Merging #967 (659bc2f) into v2 (bc8b335) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##               v2     #967      +/-   ##
==========================================
+ Coverage   64.99%   65.13%   +0.14%     
==========================================
  Files         173      174       +1     
  Lines        4282     4291       +9     
  Branches     1173     1176       +3     
==========================================
+ Hits         2783     2795      +12     
+ Misses       1498     1495       -3     
  Partials        1        1              

Impacted Files	Coverage Δ
...mbobox/__examples__/combobox-multiselect/index.tsx	100.00% <100.00%> (ø)
packages/ariakit/src/composite/composite.ts	91.85% <0.00%> (+0.74%)	⬆️
packages/ariakit/src/checkbox/checkbox-check.tsx	94.11% <0.00%> (+11.76%)	⬆️

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