Support multi-process debugging: sync breakpoints and coordinate instances #1807

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.2)	10m 19s
test (3.1)	10m 20s
test (2.7)	10m 20s
test (3.4)	10m 18s
test (3.3)	10m 19s
test (head)	10m 20s
test (4.0)	10m 20s
test (3.0)	10m 19s
test (debug)	10m 19s
	1h 32m 58s

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