feat: phyllotactic-manifold + p64 crates (additive, 44 tests) #92

Job	Run time
clippy/stable	23s
nostd/thumbv6m-none-eabi/stable	29s
format/stable	21s
native-backend/stable	38s
cross_test/s390x-unknown-linux-gnu/stable	1m 35s
Pass MSRV values to other jobs	4s
cross_test/i686-unknown-linux-gnu/stable	1m 28s
docs/nightly	0s
miri	0s
cargo-careful	0s
blas-msrv	1m 8s
tests/stable	1m 23s
tests/beta	1m 21s
tests/1.64.0	1m 20s
conclusion	-1s
	10m 9s

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