[Feature Request] CDK Resizable

#### Please describe the feature you would like to request.
Add cdkResize (along with cdkResizeHandle) to the CDK to allow resizing of elements such as divs or any other element.

#### What is the use-case or motivation for this proposal?
I believe that it would complement the new drag and drop functionality very well and would be especially useful to those making dashboard like applications, such as myself..

#### Is there anything else we should know?
Should also probably have the similar events to the cdkDrag ones (startResizing, stopResizing, etc).

No se nombran archivos, pruebas ni puntos de entrada. Empieza revisando la funcionalidad de arrastrar y soltar de CDK mencionada en el issue y determina el alcance de cdkResize, cdkResizeHandle y los eventos relacionados; la solicitud estará completa cuando la API prevista, los elementos compatibles, el comportamiento del redimensionamiento y la semántica de los eventos estén definidos y probados.

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