feat: Decoder engines (#387) #1631

Job	Run time
build (ubuntu-24.04, clang-18)	4m 47s
build-test-downstream (ubuntu-24.04, clang-18)	2m 2s
build (ubuntu-24.04, gcc-14)	4m 40s
build-test-downstream (ubuntu-24.04, gcc-14)	3m 5s
build (macos-13, clang-14)	5m 20s
build-test-downstream (macos-13, clang-14)	2m 22s
build (macos-14, armv8-clang-14)	20m 57s
build (windows-2022, msvc-1940)	3m 18s
build-test-downstream (macos-14, armv8-clang-14)	1m 41s
build-test-downstream (windows-2022, msvc-1940)	3m 54s
test	0s
docker	0s
	52m 6s

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