HttpClientFactory: Expose a method to customize the underlying #1248

Job	Run time
Maven build (ubuntu-latest, JDK 8)	4m 2s
Main Maven build (ubuntu-latest, JDK 11)	9m 58s
Maven build (ubuntu-latest, JDK 17)	6m 10s
Maven build (macOS-latest, JDK 8)	7m 57s
Maven build (macOS-latest, JDK 11)	6m 40s
Maven build (macOS-latest, JDK 17)	7m 6s
Maven build (windows-latest, JDK 8)	11m 42s
Maven build (windows-latest, JDK 11)	9m 57s
Maven build (windows-latest, JDK 17)	5m 30s
	1h 9m 2s

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