[WIP] feat(cesium): optional Cesium/ArcGIS reference + parity oracle crate #503

Job	Run time
tier4-avx512-check	25s
Pass MSRV values to other jobs	2s
clippy/1.95.0	42s
nostd/thumbv6m-none-eabi/stable	28s
native-backend/stable	8m 20s
format/stable	20s
hpc-stream-parallel/rayon	1m 16s
nightly-simd-polyfill	0s
cargo-careful	-1s
docs/nightly	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
miri	-1s
tests/stable	10m 45s
tests/1.95.0	10m 35s
tests/beta	11m 24s
blas-msrv	46s
conclusion	0s
	44m 59s

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