Integrate lossless forward transform intrinsics #4710

Job	Run time
rustfmt-clippy	3m 15s
build-unix (beta-build)	4m 41s
build-unix (1.70.0-tests)	5m 45s
build-unix (aom-tests)	8m 48s
build-windows (cargo-build, x86_64-pc-windows-msvc)	8m 44s
build-macos (Cargo build (x64), cargo-build, x86_64-apple-darwin)	4m 59s
build-unix (dav1d-tests)	8m 22s
build-windows (cargo-test, x86_64-pc-windows-msvc)	10m 7s
build-macos (Cargo test (x64), cargo-test, x86_64-apple-darwin)	5m 23s
build-unix (no-asm-tests)	14m 10s
build-windows (cargo-c, x86_64-pc-windows-gnu)	10m 34s
build-macos (Cargo C-build (x64), cargo-c, x86_64-apple-darwin)	6m 28s
build-unix (grcov-codecov)	12m 41s
build-macos (Cargo build (Arm64), cargo-build, aarch64-apple-darwin)	4m 24s
build-unix (bench)	4m 27s
build-macos (Cargo C-build (Arm64), cargo-c, aarch64-apple-darwin)	8m 7s
build-unix (doc)	2m 58s
build-unix (cargo-c)	7m 21s
build-unix (check-no-default)	1m 43s
build-unix (check-extra-feats)	2m 53s
build-unix (check-unstable-feats)	3m 50s
build-unix (fuzz)	5m 2s
build-unix (dav1d-tests-arm64, stable)	8m 44s
	2h 33m 26s

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