Add phase angle calculation functions for complex arrays #599

Job	Run time
clippy/stable	18s
cargo-careful	1m 48s
Pass MSRV values to other jobs	3s
cross_test/i686-unknown-linux-gnu/stable	1m 37s
format/nightly	13s
nostd/thumbv6m-none-eabi/stable	15s
miri	10m 16s
docs/nightly	23s
cross_test/s390x-unknown-linux-gnu/stable	1m 52s
blas-msrv	43s
tests/stable	2m 32s
tests/beta	2m 32s
tests/nightly	2m 21s
tests/1.64.0	2m 36s
conclusion	0s
	27m 29s

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