ARROW-14774: [JS] Correct package exports
ARROW-14774: [JS] Correct package exports

Closes #11742 from domoritz/dom/correct-exports

Authored-by: Dominik Moritz <addeb72ed7b7df5f4ba2327b9379e72239c27bb5@gmail.com>
Signed-off-by: Dominik Moritz <addeb72ed7b7df5f4ba2327b9379e72239c27bb5@gmail.com>

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