Make extension codecs composable #715

Job	Run time
build / lint-toml	9s
build / lint-python	11s
build / generate-license	2m 29s
build / lint-rust	32s
build / check-crates-patch	0s
build / Linux arm64 (abi3)	10m 54s
build / Linux x86_64 (abi3)	26m 49s
build / Linux x86_64 (3.14t)	12m 53s
build / macOS arm64 (abi3)	11m 21s
build / Linux arm64 (3.14t)	11m 19s
build / Windows x86_64 (abi3)	8m 36s
build / macOS arm64 (3.14t)	7m 59s
build / Windows x86_64 (3.14t)	4m 2s
build / Source distribution	0s
build / macOS x86_64 (${{ matrix.python-tag }})	0s
build / Build docs	1m 16s
build / Merge build artifacts	0s
test / test-matrix (3.10, abi3, false)	3m 16s
test / test-matrix (3.12, abi3, false)	3m 56s
test / test-matrix (3.14t, 3.14t, true)	47s
test / test-matrix (3.13, abi3, false)	4m 13s
test / test-matrix (3.11, abi3, false)	4m 41s
test / test-matrix (3.14, abi3, false)	4m 45s
	2h 0m 8s

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