chore: Add v2 base structure

[diegohaz]

No description provided.

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[codecov]

Codecov Report

Merging #932 (ecf193d) into v2 (83e4825) will decrease coverage by 64.08%.
The diff coverage is 37.52%.

@@             Coverage Diff             @@
##               v2     #932       +/-   ##
===========================================
- Coverage   94.87%   30.78%   -64.09%     
===========================================
  Files         231      142       -89     
  Lines        3510     4044      +534     
  Branches      950     1150      +200     
===========================================
- Hits         3330     1245     -2085     
- Misses        179     2798     +2619     
  Partials        1        1               

Impacted Files	Coverage Δ
packages/ariakit/src/checkbox/__utils.ts	0.00% <0.00%> (ø)
packages/ariakit/src/checkbox/checkbox-check.tsx	0.00% <0.00%> (ø)
packages/ariakit/src/checkbox/checkbox-state.ts	0.00% <0.00%> (ø)
packages/ariakit/src/checkbox/checkbox.tsx	0.00% <0.00%> (ø)
packages/ariakit/src/collection/collection.tsx	0.00% <0.00%> (ø)
...kages/ariakit/src/composite/composite-container.ts	0.00% <0.00%> (ø)
packages/ariakit/src/composite/composite-input.ts	0.00% <0.00%> (ø)
...kages/ariakit/src/composite/composite-typeahead.ts	0.00% <0.00%> (ø)
...ges/ariakit/src/dialog/__utils/dialog-backdrop.tsx	0.00% <0.00%> (ø)
...alog/__utils/disable-accessibility-tree-outside.ts	0.00% <0.00%> (ø)
... and 363 more

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