Build

BinaryHeap: add `BinaryHeapView`, similar to `VecView` #780

Job	Run time
test	27s
testmiri	1m 11s
style	10s
clippy	17s
check (x86_64-unknown-linux-gnu)	27s
doc (x86_64-unknown-linux-gnu)	23s
check (i686-unknown-linux-musl)	18s
testcfail	15s
doc (thumbv7m-none-eabi)	22s
check (riscv32imc-unknown-none-elf)	30s
check (armv7r-none-eabi)	32s
testtsan (x86_64-unknown-linux-gnu)	34s
check (thumbv6m-none-eabi)	26s
testtsan (x86_64-unknown-linux-gnu, --release)	38s
testcpass (x86_64-unknown-linux-gnu)	12s
check (thumbv7m-none-eabi)	20s
testcpass (x86_64-unknown-linux-gnu, --release)	10s
check (thumbv8m.base-none-eabi)	27s
testcpass (i686-unknown-linux-musl)	16s
check (thumbv8m.main-none-eabi)	17s
testcpass (i686-unknown-linux-musl, --release)	12s
	8m 24s

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