Add `insert_sorted` #318

Job	Run time
clippy	17s
miri	2m 38s
Check MSRV and minimal-versions	3m 30s
nostd_build (1.63.0, thumbv6m-none-eabi)	3m 25s
nostd_build (stable, thumbv6m-none-eabi)	8s
tests (1.63.0)	3m 49s
tests (stable, arbitrary)	32s
tests (stable, quickcheck)	46s
tests (stable, rayon)	38s
tests (stable, rustc-rayon)	45s
tests (stable, serde)	37s
tests (stable, std)	36s
tests (beta)	41s
tests (nightly, test build benchmarks)	40s
Success	1s
	19m 3s

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