PR-X3: BlockedGrid hierarchical block layout (workers A1-A5 + design docs) #318

Job	Run time
native-backend/stable	7m 54s
clippy/1.95.0	44s
format/stable	21s
hpc-stream-parallel/rayon	1m 25s
Pass MSRV values to other jobs	4s
nostd/thumbv6m-none-eabi/stable	29s
miri	0s
cargo-careful	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
docs/nightly	0s
blas-msrv	51s
tests/beta	11m 26s
tests/stable	9m 21s
tests/1.95.0	10m 36s
conclusion	0s
	43m 11s

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