Add general user init hooks to onCreate and postStart (#95) #844

Job	Run time
Run linters	16s
Run unit tests (setup)	32s
Run Integration Test (python, setup)	1m 22s
Run unit tests (grpc-interface-support)	34s
Run Integration Test (python, grpc-interface-support)	1m 22s
Run unit tests (vehicle-model-lifecycle)	40s
Run Integration Test (python, vehicle-model-lifecycle)	1m 3s
Run unit tests (sdk-installer)	32s
Run Integration Test (python, sdk-installer)	1m 16s
Run unit tests (build-system/cpp-cmake-conan)	37s
Run Integration Test (python, build-system/cpp-cmake-conan)	1m 0s
Run Integration Test (cpp, setup)	3m 7s
Run Integration Test (cpp, grpc-interface-support)	5m 4s
Run Integration Test (cpp, vehicle-model-lifecycle)	3m 29s
Run Integration Test (cpp, sdk-installer)	2m 57s
Run Integration Test (cpp, build-system/cpp-cmake-conan)	3m 6s
	26m 57s

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