Add phase angle calculation functions for complex arrays #592

Job	Run time
Pass MSRV values to other jobs	3s
docs/nightly	20s
format/nightly	13s
miri	10m 50s
cross_test/i686-unknown-linux-gnu/stable	1m 40s
clippy/stable	19s
cross_test/s390x-unknown-linux-gnu/stable	1m 58s
nostd/thumbv6m-none-eabi/stable	11s
cargo-careful	1m 45s
blas-msrv	32s
tests/1.64.0	34s
tests/stable	29s
tests/beta	27s
tests/nightly	31s
conclusion	-1s
	19m 51s

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