Add phase angle calculation functions for complex arrays #612

Job	Run time
docs/nightly	22s
clippy/stable	27s
format/nightly	15s
nostd/thumbv6m-none-eabi/stable	18s
miri	11m 56s
cross_test/s390x-unknown-linux-gnu/stable	1m 59s
cross_test/i686-unknown-linux-gnu/stable	1m 45s
Pass MSRV values to other jobs	3s
cargo-careful	2m 5s
blas-msrv	48s
tests/beta	2m 26s
tests/nightly	2m 39s
tests/stable	2m 24s
tests/1.64.0	2m 39s
conclusion	0s
	30m 6s

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