Refactor dict serializer #289

Job	Run time
Build Windows wheel (3.8)	1m 30s
Build Linux x86_64 wheel (cp38-cp38)	1m 19s
Build Linux wheel (3.8, linux/arm64, aarch64-unknown-linux-gnu)	4m 31s
Build Windows wheel (3.9)	1m 21s
Build Linux x86_64 wheel (cp39-cp39)	1m 19s
Build Linux wheel (3.8, linux/arm/v7, armv7-unknown-linux-gnueabihf, --no-default-features)	6m 12s
Build Windows wheel (3.10)	2m 0s
Build Linux x86_64 wheel (cp310-cp310)	1m 15s
Build Linux wheel (3.9, linux/arm64, aarch64-unknown-linux-gnu)	3m 59s
Build Windows wheel (3.11)	1m 22s
Build Linux x86_64 wheel (cp311-cp311)	1m 14s
Build Linux wheel (3.9, linux/arm/v7, armv7-unknown-linux-gnueabihf, --no-default-features)	4m 59s
Build macOS universal wheel (3.8)	1m 36s
Build Windows wheel (3.12)	1m 34s
Build Linux x86_64 wheel (cp312-cp312)	1m 13s
Build Linux wheel (3.10, linux/arm64, aarch64-unknown-linux-gnu)	3m 27s
Build macOS universal wheel (3.9)	1m 35s
Build Linux wheel (3.10, linux/arm/v7, armv7-unknown-linux-gnueabihf, --no-default-features)	4m 22s
Build macOS universal wheel (3.10)	1m 51s
Build Linux wheel (3.11, linux/arm64, aarch64-unknown-linux-gnu)	3m 15s
Build sdist	25s
Build macOS universal wheel (3.11)	2m 25s
Build Linux wheel (3.11, linux/arm/v7, armv7-unknown-linux-gnueabihf, --no-default-features)	4m 10s
Build macOS universal wheel (3.12)	2m 53s
Build Linux wheel (3.12, linux/arm64, aarch64-unknown-linux-gnu)	3m 17s
Build Linux wheel (3.12, linux/arm/v7, armv7-unknown-linux-gnueabihf, --no-default-features)	4m 35s
Release	0s
	1h 7m 39s

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