PR-X3: BlockedGrid hierarchical block layout (workers A1-A5 + design docs) #316

Job	Run time
native-backend/stable	7m 40s
nostd/thumbv6m-none-eabi/stable	27s
clippy/1.95.0	38s
hpc-stream-parallel/rayon	1m 18s
format/stable	23s
Pass MSRV values to other jobs	2s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	0s
cargo-careful	0s
docs/nightly	0s
blas-msrv	52s
tests/beta	9m 37s
tests/stable	10m 23s
tests/1.95.0	10m 29s
conclusion	0s
	41m 49s

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