Reline/ReadlineInputMethod should inherit StdioInputMethod (#671) #2371

Job	Run time
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 31s
vterm-yamatanooroti 2.7	1m 32s
vterm-yamatanooroti 3.0 (latest reline)	41s
vterm-yamatanooroti 3.0	39s
vterm-yamatanooroti 3.1 (latest reline)	56s
vterm-yamatanooroti 3.1	46s
vterm-yamatanooroti 3.2 (latest reline)	43s
vterm-yamatanooroti 3.2	52s
vterm-yamatanooroti head (latest reline)	50s
vterm-yamatanooroti head	42s
rake test 2.7 (latest reline)	43s
rake test 2.7	58s
rake test 3.0 (latest reline)	36s
rake test 3.0	29s
rake test 3.1 (latest reline)	38s
rake test 3.1	30s
rake test 3.2 (latest reline)	35s
rake test 3.2	37s
rake test head (latest reline)	37s
rake test head	30s
rake test truffleruby-head (latest reline)	7m 6s
rake test truffleruby-head	7m 53s
	30m 26s

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