refactor: Implement msgspec encoding #6421

Job	Run time
External Tests	2m 7s
Test on 3.8 (tests) / ubuntu-latest / SQLAlchemy: 2	42s
Test on 3.9 (tests) / ubuntu-latest / SQLAlchemy: 2	12m 22s
Test on 3.10 (tests) / ubuntu-latest / SQLAlchemy: 2	43s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 2	37s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 2	41s
Test on 3.8 (tests) / macos-latest / SQLAlchemy: 2	1m 17s
Test on 3.9 (tests) / macos-latest / SQLAlchemy: 2	40s
Test on 3.10 (tests) / macos-latest / SQLAlchemy: 2	38s
Test on 3.11 (tests) / macos-latest / SQLAlchemy: 2	33s
Test on 3.12 (tests) / macos-latest / SQLAlchemy: 2	35s
Test on 3.8 (tests) / windows-latest / SQLAlchemy: 2	1m 36s
Test on 3.9 (tests) / windows-latest / SQLAlchemy: 2	1m 42s
Test on 3.10 (tests) / windows-latest / SQLAlchemy: 2	1m 48s
Test on 3.11 (tests) / windows-latest / SQLAlchemy: 2	1m 47s
Test on 3.12 (tests) / windows-latest / SQLAlchemy: 2	2m 1s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 1	39s
Test on 3.12 (doctest) / ubuntu-latest / SQLAlchemy: 2	25s
Test on 3.12 (mypy) / ubuntu-latest / SQLAlchemy: 2	39s
Test on 3.12 (deps) / ubuntu-latest / SQLAlchemy: 2	39s
Coverage	26s
	32m 37s

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