FR: Make @WithTimeout applicable to classes

[wazzeps]

Description

At the moment, the @WithTimeout annotation can only be applied to fields.

Often when working with widgets, having the root element ready means that the inner elements will also be ready for interaction. @WithTimeout annotation is great for reducing the time spent searching for inner elements, but requires application for each field. It would be nice to have the ability to apply annotations to all widget class fields at once.