fix: add support for idle connection monitoring (opt-in for now) #3175

Job	Run time
downstream	6m 22s
all-platforms (ubuntu-latest)	5m 19s
jvm (8)	3m 27s
all-platforms (macos-latest)	4m 27s
jvm (11)	3m 15s
all-platforms (windows-latest)	7m 28s
protocol-tests	8m 41s
jvm (17)	3m 16s
jvm (21)	3m 11s
	45m 26s

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