refactor(metrics/histogram): 🎂 constructor accepts `IntoIterator` #868

Job	Run time
Check rustdoc intra-doc links	26s
Cross compile (armv7-unknown-linux-gnueabihf)	17s
Clippy	1m 12s
Cross compile (powerpc-unknown-linux-gnu)	16s
Check	1m 38s
Cross compile (powerpc64-unknown-linux-gnu)	17s
Cross compile (wasm32-unknown-unknown)	18s
Rustfmt	19s
Test Suite	1m 37s
	6m 20s

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