[New] add `Iterator.prototype` shim #58

Job	Run time
tests / build	13s
tests / matrix	7s
tests / latest minors (9.11)	14m 7s
tests / latest minors (8.17)	14m 2s
tests / latest minors (7.10)	14m 49s
tests / latest minors (6.17)	14m 29s
tests / latest minors (5.12)	15m 35s
tests / latest minors (4.9)	16m 55s
tests / latest minors (3.3)	3m 46s
tests / latest minors (2.5)	5m 57s
tests / latest minors (1.8)	4m 13s
tests / latest minors (0.12)	4m 1s
tests / latest minors (0.10)	3m 55s
tests / latest minors (0.8)	4m 5s
tests / non-latest minors	0s
tests / node ${{ inputs.type }} @ ${{ inputs.range }}	0s
node < 10	0s
	1h 56m 14s

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