HttpClientFactory: Expose a method to customize the underlying #1274

Job	Run time
Maven build (ubuntu-latest, JDK 8)	3m 46s
Main Maven build (ubuntu-latest, JDK 11)	6m 41s
Maven build (ubuntu-latest, JDK 17)	4m 5s
Maven build (macOS-latest, JDK 8)	6m 5s
Maven build (macOS-latest, JDK 11)	17m 46s
Maven build (macOS-latest, JDK 17)	11m 11s
Maven build (windows-latest, JDK 8)	5m 56s
Maven build (windows-latest, JDK 11)	6m 20s
Maven build (windows-latest, JDK 17)	6m 48s
	1h 8m 38s

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