Draft: Add peek to ArrayQueue<T> where T: Copy #2320

Job	Run time
features (1.38)	1m 20s
features (nightly)	49s
test (1.38, ubuntu-latest)	15m 21s
test (1.38, windows-latest)	24m 4s
test (stable, ubuntu-latest)	11m 20s
test (stable, windows-latest)	19m 15s
test (nightly, ubuntu-latest)	11m 45s
test (nightly, windows-latest)	18m 18s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	12m 10s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	17m 31s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	21m 0s
clippy	22s
dependencies	22s
careful	7m 8s
codegen	53s
miri	25m 5s
loom	1m 47s
rustfmt	4s
san	16m 26s
docs	19s
shellcheck	11s
ci	0s
	3h 25m 30s

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