Significantly overhaul the `ApnsClientMetricsListener` interface #191

Job	Run time
JDK 8, ubuntu-22.04, native transport, native SSL provider	1m 8s
JDK 8, ubuntu-22.04, native transport, JDK SSL provider	1m 11s
JDK 8, ubuntu-22.04, JDK transport, native SSL provider	1m 6s
JDK 8, ubuntu-22.04, JDK transport, JDK SSL provider	58s
JDK 17, ubuntu-22.04, native transport, native SSL provider	1m 4s
JDK 17, ubuntu-22.04, native transport, JDK SSL provider	1m 2s
JDK 17, ubuntu-22.04, JDK transport, native SSL provider	1m 10s
JDK 17, ubuntu-22.04, JDK transport, JDK SSL provider	1m 5s
JDK 21, ubuntu-22.04, native transport, native SSL provider	1m 14s
JDK 21, ubuntu-22.04, native transport, JDK SSL provider	1m 9s
JDK 21, ubuntu-22.04, JDK transport, native SSL provider	1m 3s
JDK 21, ubuntu-22.04, JDK transport, JDK SSL provider	1m 7s
JDK 8, macos-latest, native transport, native SSL provider	5m 37s
JDK 8, macos-latest, native transport, JDK SSL provider	1m 33s
JDK 8, macos-latest, JDK transport, native SSL provider	1m 25s
JDK 8, macos-latest, JDK transport, JDK SSL provider	1m 22s
JDK 17, macos-latest, native transport, native SSL provider	1m 48s
JDK 17, macos-latest, native transport, JDK SSL provider	1m 38s
JDK 17, macos-latest, JDK transport, native SSL provider	1m 22s
JDK 17, macos-latest, JDK transport, JDK SSL provider	1m 31s
JDK 21, macos-latest, native transport, native SSL provider	1m 23s
JDK 21, macos-latest, native transport, JDK SSL provider	1m 21s
JDK 21, macos-latest, JDK transport, native SSL provider	1m 23s
JDK 21, macos-latest, JDK transport, JDK SSL provider	3m 30s
	37m 10s

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