test

Provide standard library as stdlib.y #1068

Job	Run time
steep-check (head)	11s
test-memory (head)	26s
check-misc (head)	6s
test-ruby (head, master)	5m 13s
test-windows (head)	1m 42s
test-ruby (3.0, master)	5m 24s
test-ruby (2.7, master)	8m 49s
ruby-versions / Generate Ruby versions	2s
test (2.5)	22s
test (2.6)	27s
test (2.7)	26s
test (3.0)	9s
test (3.1)	14s
test (3.2)	9s
test (3.3)	10s
test (head)	8s
	23m 58s

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