User implemented callback to get notification when the module is ready.

typedef JsErrorCode (CHAKRA_CALLBACK * NotifyModuleReadyCallback) (    _In_opt_ JsModuleRecord referencingModule,    _In_opt_ JsValueRef exceptionVar);

• referencingModule: The referencing module that has finished running ModuleDeclarationInstantiation step.
• exceptionVar: If nullptr, the module is successfully initialized and host should queue the execution job otherwise it's the exception object.

Returns a JsErrorCode - note, the return value is ignored.

The callback is invoked on the current runtime execution thread, therefore execution is blocked until the callback completes. This callback should schedule a call to JsEvaluateModule to run the module that has been loaded.