move HAL and tests folder

src/fsfw_tests/internal/CMakeLists.txt

@@ -0,0 +1,8 @@
+target_sources(${LIB_FSFW_NAME} PRIVATE
+	InternalUnitTester.cpp
+	UnittDefinitions.cpp
+)
+
+add_subdirectory(osal)
+add_subdirectory(serialize)
+add_subdirectory(globalfunctions)