Support adding a new optional prop to an in-use code component

Overview

Code components, once they're added to components, i.e. become exposed, lock props and slots. This was implemented in ✨ Editing components sourced as code components Active .

In 🌱 Plan to allow editing props and slots for exposed code components Active we're working to relax that for cases we know we can support

Proposed resolution

Support adding a new optional prop to a code component

User interface changes