Move IO configuration to IRB::Irb #2377

Job	Run time
ruby-versions / Generate Ruby versions	1s
vterm-yamatanooroti 2.7 (latest reline)	1m 13s
vterm-yamatanooroti 2.7	1m 13s
vterm-yamatanooroti 3.0 (latest reline)	44s
vterm-yamatanooroti 3.0	48s
vterm-yamatanooroti 3.1 (latest reline)	55s
vterm-yamatanooroti 3.1	46s
vterm-yamatanooroti 3.2 (latest reline)	43s
vterm-yamatanooroti 3.2	1m 11s
vterm-yamatanooroti head (latest reline)	43s
vterm-yamatanooroti head	41s
rake test 2.7 (latest reline)	53s
rake test 2.7	58s
rake test 3.0 (latest reline)	35s
rake test 3.0	30s
rake test 3.1 (latest reline)	39s
rake test 3.1	33s
rake test 3.2 (latest reline)	29s
rake test 3.2	38s
rake test head (latest reline)	34s
rake test head	39s
rake test truffleruby-head (latest reline)	7m 12s
rake test truffleruby-head	7m 10s
	29m 48s

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