[GR-47186] Unified native-image classloader for module- and class-path. #7302
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This custom class loader is used by the image builder to load the application classes that should be built into a native-image. It can load classes from a user-provided application module- and class-path. This is different from the existing classloaders that the JDK provides. While ModuleLayer.defineModulesWith methods only allow loading modules at runtime, URLClassLoader only allows loading classes on classpath at runtime. This is insufficient for the image builder as it needs to be able to load from both, module- and class-path, with the same loader so that classes on the given class-path are able to access classes from the given module-path.