feat: Load client config from arbitrary config block #1450

Job	Run time
Checks	1m 33s
Docs	3m 43s
Compile and test (2.13)	4m 29s
Compile Benchmarks	2m 16s
Compile and test (3.3)	5m 0s
Gradle tests	3m 37s
Maven tests	2m 51s
sbt scripted tests (gen-scala-server, 2.13)	7m 42s
sbt scripted tests (gen-java, 2.13)	3m 59s
sbt scripted tests (scala-2_13, 2.13)	3m 1s
sbt scripted tests (scala3, 3.3)	3m 11s
	41m 22s

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