Add forward and inverse Walsh-Hadamard transforms #4666

Job	Run time
build-macos (Cargo build (x64), cargo-build, x86_64-apple-darwin)	5m 21s
build-windows (cargo-build, x86_64-pc-windows-msvc)	6m 8s
build-macos (Cargo test (x64), cargo-test, x86_64-apple-darwin)	5m 22s
rustfmt-clippy	2m 39s
build-windows (cargo-test, x86_64-pc-windows-msvc)	9m 55s
build-macos (Cargo C-build (x64), cargo-c, x86_64-apple-darwin)	8m 8s
build-unix (beta-build)	4m 25s
build-windows (cargo-c, x86_64-pc-windows-gnu)	12m 1s
build-macos (Cargo build (Arm64), cargo-build, aarch64-apple-darwin)	4m 53s
build-unix (1.70.0-tests)	5m 40s
build-macos (Cargo C-build (Arm64), cargo-c, aarch64-apple-darwin)	6m 14s
build-unix (aom-tests)	9m 20s
build-unix (dav1d-tests)	9m 28s
build-unix (no-asm-tests)	14m 41s
build-unix (grcov-codecov)	13m 24s
build-unix (bench)	5m 58s
build-unix (doc)	4m 19s
build-unix (cargo-c)	6m 50s
build-unix (check-no-default)	1m 43s
build-unix (check-extra-feats)	3m 32s
build-unix (check-unstable-feats)	3m 31s
build-unix (fuzz)	6m 4s
build-unix (dav1d-tests-arm64, stable)	8m 50s
	2h 38m 26s

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