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ARROW-12636: [JS] ESM Tree-Shaking produces broken code

This pull request marks arrow as having side effects since we do have side effects in the code.

Closes #10826 from domoritz/sideEffects

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