Tests

Add OS info contracts package and optimize OS info #64

Job	Run time
Tests (8.4, macos-latest, prefer-lowest)	1m 8s
Tests (8.4, windows-latest, prefer-lowest)	33s
Tests (8.5, macos-latest, prefer-stable)	1m 13s
Tests (8.4, ubuntu-latest, prefer-stable)	16s
Tests (8.5, ubuntu-latest, prefer-lowest)	23s
Tests (8.4, windows-latest, prefer-stable)	35s
Tests (8.5, macos-latest, prefer-lowest)	1m 13s
Tests (8.5, ubuntu-latest, prefer-stable)	17s
Tests (8.4, macos-latest, prefer-stable)	1m 38s
Tests (8.4, ubuntu-latest, prefer-lowest)	13s
Tests (8.5, windows-latest, prefer-lowest)	36s
Tests (8.5, windows-latest, prefer-stable)	35s
	8m 40s

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