test

Provide standard library as stdlib.y #1056

Job	Run time
test-windows (head)	1m 36s
check-misc (head)	6s
steep-check (head)	11s
test-memory (head)	28s
test-ruby (head, master)	5m 28s
test-ruby (3.0, master)	5m 20s
test-ruby (2.5, master)	5m 38s
ruby-versions / Generate Ruby versions	2s
test (2.5)	26s
test (2.6)	26s
test (2.7)	22s
test (3.0)	9s
test (3.1)	12s
test (3.2)	9s
test (3.3)	10s
test (head)	11s
	20m 54s

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