Introduce `IterableMapEntryExtension` for use with `Map.entries`. #103

Job	Run time
health / changelog / run changelog health check	30s
health / coverage / run coverage health check	1m 1s
health / breaking / run breaking health check	37s
health / license / run license health check	30s
health / do-not-submit / run do-not-submit health check	44s
health / leaking / run leaking health check	41s
health / comment	4s
	4m 7s

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