Group class methods under `class << self` #3841

Job	Run time
lint	10s
Debug compatibility test	5m 47s
ruby-versions / Generate Ruby versions	7s
rake test 2.7 (latest reline)	1m 30s
vterm-yamatanooroti 2.7 (latest reline)	1m 3s
rake test 2.7	1m 37s
vterm-yamatanooroti 2.7	1m 5s
rake test 3.0 (latest reline)	1m 25s
vterm-yamatanooroti 3.0 (latest reline)	50s
rake test 3.0	1m 24s
vterm-yamatanooroti 3.0	1m 0s
rake test 3.1 (latest reline)	1m 27s
vterm-yamatanooroti 3.1 (latest reline)	53s
rake test 3.1	1m 26s
vterm-yamatanooroti 3.1	52s
rake test 3.2 (latest reline)	1m 31s
vterm-yamatanooroti 3.2 (latest reline)	55s
rake test 3.2	1m 27s
vterm-yamatanooroti 3.2	59s
rake test 3.3 (latest reline)	1m 32s
vterm-yamatanooroti 3.3 (latest reline)	56s
rake test 3.3	1m 32s
rake test head (latest reline)	1m 37s
vterm-yamatanooroti 3.3	1m 2s
rake test head	1m 42s
vterm-yamatanooroti head (latest reline)	1m 1s
rake test truffleruby-head (latest reline)	3m 4s
vterm-yamatanooroti head	57s
rake test truffleruby-head	2m 44s
	41m 35s

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