Add conformance testing CI pipeline #229

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	32s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, windows-latest)	3m 22s
checks / test (3.10, locked, windows-latest)	2m 39s
checks / test (3.10, lowest-direct, windows-latest)	3m 16s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.10, locked, ubuntu-latest)	43s
checks / test (3.12, locked, windows-latest)	3m 23s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	3m 32s
checks / test (3.14, lowest-direct, windows-latest)	2m 16s
checks / test (3.11, lowest-direct, windows-latest)	2m 28s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 32s
checks / test (3.11, locked, windows-latest)	2m 54s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
all-green	3s
	39m 12s

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