Add 3DGS error certification pillars plan #472

Job	Run time
nostd/thumbv6m-none-eabi/stable	26s
Pass MSRV values to other jobs	2s
docs/nightly	49s
cargo-careful	44s
hpc-stream-parallel/rayon	1m 19s
miri	1m 12s
nightly-simd-polyfill	33s
format/stable	21s
native-backend/stable	7m 39s
clippy/1.95.0	37s
tier4-avx512-check	30s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
blas-msrv	48s
tests/1.95.0	10m 24s
tests/stable	11m 6s
tests/beta	11m 39s
conclusion	-1s
	48m 7s

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