refactor(metrics/histogram): constructor accepts `IntoIterator` #8

Job	Run time
Check rustdoc intra-doc links	25s
Cross compile (armv7-unknown-linux-gnueabihf)	11s
Clippy	1m 12s
Check	1m 30s
Cross compile (powerpc-unknown-linux-gnu)	19s
Rustfmt	7s
Cross compile (powerpc64-unknown-linux-gnu)	19s
Test Suite	1m 36s
Cross compile (wasm32-unknown-unknown)	12s
	5m 51s

Provide feedback