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LinearMap: add `LinearMapView`, similar to `VecView` #781

Job	Run time
test	22s
clippy	13s
check (x86_64-unknown-linux-gnu)	30s
style	13s
check (i686-unknown-linux-musl)	18s
testmiri	1m 7s
check (riscv32imc-unknown-none-elf)	20s
doc (x86_64-unknown-linux-gnu)	24s
check (armv7r-none-eabi)	25s
doc (thumbv7m-none-eabi)	21s
testcfail	25s
check (thumbv6m-none-eabi)	26s
check (thumbv7m-none-eabi)	22s
check (thumbv8m.base-none-eabi)	26s
testcpass (x86_64-unknown-linux-gnu)	14s
check (thumbv8m.main-none-eabi)	21s
testcpass (x86_64-unknown-linux-gnu, --release)	23s
testcpass (i686-unknown-linux-musl)	13s
testtsan (x86_64-unknown-linux-gnu)	32s
testcpass (i686-unknown-linux-musl, --release)	10s
testtsan (x86_64-unknown-linux-gnu, --release)	42s
	8m 27s

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