Added utility method Binder#asRequired()  (#9873)
Added utility method Binder#asRequired()  (#9873)

* Added the possiblity of defining a Field as Required without
setting an error message.

* Added @since to asRequired()

* Add droped paragraphs and see tag for asRequired(String)

mstahv/framework,mstahv/framework,Darsstar/framework,asashour/framework,asashour/framework,mstahv/framework,Darsstar/framework,mstahv/framework,asashour/framework,Darsstar/framework,mstahv/framework,asashour/framework,Darsstar/framework,asashour/framework,Darsstar/framework