toConstructor @injectable() should not required @inject annotations

[remojansen]

Expected Behavior

If missing @inject annotations we should throw a MISSING_INJECT_ANNOTATION error. But if the binding is a toConstructor then no @inject annotations should be required.

Current Behavior

If missing @inject annotations we always throw an error. Users can use @inject annotation to fix the issue but these annotations are not required.

Possible Solution

Do not throw error is toConsturctor binding.

Steps to Reproduce (for bugs)

let kernel = new Kernel();
kernel.bind<Newable<any>>("Newable<Category>").toConstructor(Category);

@injectable()
export class Category {
constructor(
    id: string,
    title: string,
    categoryFirstPermalink: string,
    categoryPermalink: string,
    pagination: number,
    categorySortingFn: ICategorySortingFn,
    contentSortingFn: IContentSortingFn,
    belongsToCollection: Collection
  ) {}
}

let expectedThisToBeTheConstructor = kernel.get(Category);
// Error: Missing required @inject or @multiInject annotation in: argument 5 in class Category.

Context

This issue was reported by @ubenzer