Add general user init hooks to onCreate and postStart #843

Job	Run time
Run linters	13s
Run unit tests (setup)	35s
Run Integration Test (python, setup)	1m 6s
Run unit tests (grpc-interface-support)	41s
Run Integration Test (python, grpc-interface-support)	1m 26s
Run unit tests (vehicle-model-lifecycle)	34s
Run Integration Test (python, vehicle-model-lifecycle)	57s
Run unit tests (sdk-installer)	29s
Run Integration Test (python, sdk-installer)	1m 31s
Run unit tests (build-system/cpp-cmake-conan)	30s
Run Integration Test (python, build-system/cpp-cmake-conan)	53s
Run Integration Test (cpp, setup)	3m 12s
Run Integration Test (cpp, grpc-interface-support)	5m 5s
Run Integration Test (cpp, vehicle-model-lifecycle)	3m 33s
Run Integration Test (cpp, sdk-installer)	3m 3s
Run Integration Test (cpp, build-system/cpp-cmake-conan)	3m 13s
	27m 1s

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