Basic server mode support #849

Job	Run time
lint	21s
ruby-versions / Generate Ruby versions	4s
test (3.0, ubuntu-latest)	22s
test (3.0, macos-latest)	20s
test (3.0, windows-latest)	1m 8s
test (3.1, ubuntu-latest)	24s
test (3.1, macos-latest)	21s
test (3.1, windows-latest)	1m 33s
test (3.2, ubuntu-latest)	25s
test (3.2, macos-latest)	18s
test (3.2, windows-latest)	1m 14s
test (3.3, ubuntu-latest)	15s
test (3.3, macos-latest)	19s
test (3.3, windows-latest)	1m 29s
test (head, ubuntu-latest)	18s
test (head, macos-latest)	24s
test (head, windows-latest)	1m 10s
test (jruby, ubuntu-latest)	1m 29s
test (jruby, macos-latest)	1m 17s
test (jruby-head, ubuntu-latest)	1m 23s
test (jruby-head, macos-latest)	53s
test (truffleruby, ubuntu-latest)	1m 28s
test (truffleruby, macos-latest)	1m 16s
test (truffleruby-head, ubuntu-latest)	1m 49s
test (truffleruby-head, macos-latest)	1m 39s
	21m 39s

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