Returns an object that performs extensions of the specified type. The method never returns `null'. If the extension type has not been registered in the container, then the method does not throw an exception, but returns an object that does not perform actions.
The type of extension to return the object for.
Optional
options: null | ExtensionExecutorOptionsAdditional options for the returned object.
An object that performs extensions of the specified type.
An extension executor resolver.