Add phase angle calculation functions for complex arrays #594

Job	Run time
format/nightly	14s
cargo-careful	1m 39s
Pass MSRV values to other jobs	2s
docs/nightly	21s
cross_test/i686-unknown-linux-gnu/stable	1m 51s
clippy/stable	16s
miri	10m 56s
nostd/thumbv6m-none-eabi/stable	16s
cross_test/s390x-unknown-linux-gnu/stable	8m 38s
blas-msrv	42s
tests/beta	2m 34s
tests/nightly	2m 36s
tests/stable	2m 17s
tests/1.64.0	3m 22s
conclusion	2s
	35m 46s

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