build

chore: use pyproject.toml and modern build system #72

Job	Run time
tests-misc (generate-integration-files)	22s
tests-py (3.10)	35s
tests-py (3.9)	42s
tests-misc (build)	19s
tests-misc (lint)	17s
tests-py (pypy-3.11)	51s
tests-py (3.11)	38s
tests-py (pypy-3.10)	54s
tests-misc (type)	25s
publish	0s
	5m 3s

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