Move parse_command method to Context #3906

Job	Run time
lint	8s
Debug compatibility test	5m 46s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 20s
rake test 2.7 (latest reline)	1m 28s
rake test 2.7	1m 33s
rake test 3.0 (latest reline)	1m 24s
rake test 3.0	1m 24s
vterm-yamatanooroti 2.7	1m 2s
vterm-yamatanooroti 3.0 (latest reline)	1m 25s
rake test 3.1 (latest reline)	1m 23s
vterm-yamatanooroti 3.0	53s
rake test 3.1	1m 22s
vterm-yamatanooroti 3.1 (latest reline)	58s
rake test 3.2 (latest reline)	1m 27s
vterm-yamatanooroti 3.1	55s
rake test 3.2	1m 26s
vterm-yamatanooroti 3.2 (latest reline)	54s
rake test 3.3 (latest reline)	1m 34s
vterm-yamatanooroti 3.2	52s
rake test 3.3	1m 30s
vterm-yamatanooroti 3.3 (latest reline)	53s
rake test head (latest reline)	1m 35s
vterm-yamatanooroti 3.3	53s
rake test head	1m 32s
vterm-yamatanooroti head (latest reline)	1m 1s
rake test truffleruby-head (latest reline)	2m 51s
vterm-yamatanooroti head	52s
rake test truffleruby-head	2m 36s
	40m 59s

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