Add conformance testing CI pipeline #246

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	2m 36s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	2m 16s
checks / test (3.10, locked, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 37s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.14, lowest-direct, windows-latest)	2m 29s
checks / test (3.12, lowest-direct, windows-latest)	3m 36s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.10, locked, windows-latest)	2m 47s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.12, locked, windows-latest)	3m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 34s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.14, locked, windows-latest)	3m 5s
all-green	4s
	38m 35s

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