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ARROW-13299: [JS] Upgrade ix and rxjs

Merge after #10673, only the last commit is new

Closes #10695 from domoritz/dom/upgrades

Lead-authored-by: Dominik Moritz <domoritz@gmail.com>
Co-authored-by: ptaylor <paul.e.taylor@me.com>
Signed-off-by: Dominik Moritz <domoritz@gmail.com>