Add a list widget for 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 particular MR introduces a list type widget for the Pipeline Wizard. It allows editing a sequence of text values in the pipeline. Similar to the Text Widget it allows two-way binding of the value prop, that in this instance will be an Array of Strings. It also allows validating each input against a Regex pattern.

Screenshots or screen recordings

This MR does not yet show the widget in the UI (that will happen in a later MR), but it will look as indicated by the orange box below:

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.