Move schema related version numbers to the new schema module. #31

Job	Run time
test-isolated	9s
test-yjit (ubuntu, 3.1)	10s
test (ubuntu, 2.7)	25s
test-yjit (ubuntu, 3.2)	7s
test (ubuntu, 3.0)	10s
test-yjit (ubuntu, 3.3)	8s
test (ubuntu, 3.1)	9s
test-yjit (ubuntu, head)	11s
test (ubuntu, 3.2)	7s
test-yjit (macos, 3.1)	13s
test (ubuntu, 3.3)	9s
test-yjit (macos, 3.2)	25s
test (ubuntu, head)	7s
test-yjit (macos, 3.3)	18s
test (ubuntu, jruby)	40s
test-yjit (macos, head)	25s
test (ubuntu, jruby-head)	41s
test (ubuntu, truffleruby)	32s
test (ubuntu, truffleruby-head)	26s
test (macos, 3.0)	20s
test (windows, 3.0)	56s
finish	3s
	6m 51s

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