Add DequeView, similar to VecView and StringView #733

Job	Run time
clippy	20s
style	14s
check (x86_64-unknown-linux-gnu)	22s
check (i686-unknown-linux-musl)	20s
test	20s
testmiri	53s
check (riscv32imc-unknown-none-elf)	14s
check (armv7r-none-eabi)	16s
doc (x86_64-unknown-linux-gnu)	20s
check (thumbv6m-none-eabi)	20s
doc (thumbv7m-none-eabi)	20s
check (thumbv7m-none-eabi)	16s
check (thumbv8m.base-none-eabi)	18s
testcfail	15s
check (thumbv8m.main-none-eabi)	16s
testcpass (x86_64-unknown-linux-gnu)	13s
testtsan (x86_64-unknown-linux-gnu)	36s
testcpass (x86_64-unknown-linux-gnu, --release)	10s
testtsan (x86_64-unknown-linux-gnu, --release)	37s
testcpass (i686-unknown-linux-musl)	12s
testcpass (i686-unknown-linux-musl, --release)	13s
	7m 5s

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