Add the input wrapper widget to be used by the Pipeline Wizard

What does this MR do and why?

This MR is part of a larger effort to introduce the Pipeline Wizard Component

This MR introduces an invisible utility component. It acts as an interface between the Pipeline Wizard's Step Component and the input widgets that will deal with obtaining and validating the actual input.

Its job is to load the appropriate widget as requested by the widget prop. It will also handle all input responsibilities that would otherwise have to be implemented in all widgets, such as compiling the input into the yaml document.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.