Re-implement Paragraphs Styles UI

Problem/Motivation

Our Paragraphs styles were a good, user-friendly concept to define default styles.

So we should re-invent this feature in 4.x.
Furthermore, we might provide some default styles in the module if required.

See: ✨ Add drowl_paragraphs_styles_ui complex style selector as classes ui Fixed
& ✨ Provide default styles for the DROWL Paragraphs Styles UI Closed: won't fix

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes