pool: implemented Role Stringer interface #3860

Job	Run time
testing_mac_os (1.20, macos-12, brew)	4m 46s
run-tests-ce (1.20, 1.10, false, false)	4m 17s
testing_mac_os (1.20, macos-12, 1.10.15)	8m 10s
run-tests-ce (1.20, 2.8, false, false)	4m 8s
testing_mac_os (1.20, macos-14, brew)	3m 40s
testing_mac_os (stable, macos-12, brew)	5m 45s
run-tests-ce (1.20, 2.10, false, false)	4m 28s
testing_mac_os (stable, macos-12, 1.10.15)	5m 50s
run-tests-ce (1.20, master, false, false)	11m 33s
testing_mac_os (stable, macos-14, brew)	4m 17s
run-tests-ce (stable, 1.10, false, false)	4m 32s
run-tests-ce (stable, 2.8, false, false)	5m 11s
run-tests-ce (stable, 2.10, false, false)	4m 51s
run-tests-ce (stable, master, false, false)	12m 33s
run-tests-ce (master, true, 1.20)	13m 32s
run-tests-ce (master, true, 1.20, false)	12m 28s
	1h 50m 1s

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