Add optional Title field to each component

## Feature Request

As an Author I like optionally to add a title within each component to describe the purpose of this component. For example when creating a News List with the List component, I like to add the Title "News" within the component. Current workaround is to use a dedicated title component to do so.
As a developer I like optionally to have this title within each component to properly define styling such as paddings.

**Describe the solution you'd like**
Add a extra jcr:title field for each component. It is optional and the heading weight can be configured as in the title component. Title can be exported as well to the data layer

**Are there alternatives?**
Yes, with the title component.

Start by reviewing the existing title component and how component fields are modeled and exported to the data layer. Define what “done” means for optional titles, configurable heading weight, styling support, and consistent behavior across each component; no files or tests are named in the issue.

Written by the indexing model from the issue text.