Draft: Add peek to ArrayQueue<T> where T: Copy #2318

Job	Run time
features (1.38)	1s
features (nightly)	1s
test (1.38, ubuntu-latest)	1s
test (1.38, windows-latest)	1s
test (stable, ubuntu-latest)	1s
test (stable, windows-latest)	1s
test (nightly, ubuntu-latest)	1s
test (nightly, windows-latest)	1s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	1s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	1s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	1s
codegen	1s
clippy	1s
careful	1s
dependencies	1s
miri	1s
rustfmt	1s
san	1s
loom	1s
docs	1s
shellcheck	1s
ci	1s
	22s

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