fix: config provider: export children prop type

[dkilgore-eightfold]

SUMMARY:

Enables TypeScript implementations.

[codesandbox-ci]

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Sandbox	Source
React	Configuration
Vanilla	Configuration

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@4e9f352). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #369   +/-   ##
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  Coverage        ?   89.28%           
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  Files           ?      484           
  Lines           ?    13071           
  Branches        ?     4395           
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  Hits            ?    11670           
  Misses          ?     1377           
  Partials        ?       24           

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