Add phase angle calculation functions for complex arrays #550

Job	Run time
Pass MSRV values to other jobs	3s
clippy/stable	21s
format/nightly	16s
nostd/thumbv6m-none-eabi/stable	19s
miri	11m 33s
cargo-careful	2m 30s
docs/nightly	22s
cross_test/i686-unknown-linux-gnu/stable	1m 39s
cross_test/s390x-unknown-linux-gnu/stable	1m 54s
blas-msrv	1m 14s
tests/stable	2m 35s
tests/beta	2m 24s
tests/1.64.0	2m 39s
tests/nightly	2m 36s
conclusion	0s
	30m 25s

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