Add phase angle calculation functions for complex arrays #603

Job	Run time
Pass MSRV values to other jobs	3s
clippy/stable	14s
nostd/thumbv6m-none-eabi/stable	18s
miri	11m 9s
format/nightly	13s
cargo-careful	1m 41s
docs/nightly	22s
cross_test/s390x-unknown-linux-gnu/stable	1m 59s
cross_test/i686-unknown-linux-gnu/stable	1m 44s
blas-msrv	49s
tests/beta	2m 20s
tests/nightly	2m 29s
tests/stable	2m 15s
tests/1.64.0	2m 29s
conclusion	0s
	28m 5s

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