feat: declare exports explicitly

[TimKolberger]

This PR

• declares the bundle exports explicitly
• fixes an issue where autocomplete for intrinsic element props did not show up

[codecov]

Codecov Report

Merging #26 (01d89f1) into main (dd062b4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          145       157   +12     
  Branches        10        11    +1     
=========================================
+ Hits           145       157   +12     

Impacted Files	Coverage Δ
packages/react/src/forwardRef.tsx	100.00% <100.00%> (ø)
packages/react/src/index.ts	100.00% <100.00%> (ø)
packages/react/src/polymorphic-factory.tsx	100.00% <100.00%> (ø)

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