Resolve "Allow paragraph and heading elements to have their text alignments changed."

What is in this MR

This MR introduces text alignment for the Heading and Paragraph elements.

How to test this MR

• Add one of each element.
• Align it left, center and right.
• Preview and publish the page
• Bob's your uncle

Merge Request Checklist

• changelog.md has been updated if required.
• New/updated Premium/Enterprise features are separated correctly in the premium or enterprise folder
• The latest Chrome and Firefox have been used to test any new frontend features
• Documentation has been updated
• Quality Standards are met
• Performance: tables are still fast with 100k+ rows, 100+ field tables
• The redoc API pages have been updated for any REST API changes
• Our custom API docs are updated for changes to endpoints accessed via api tokens
• The UI/UX has been updated following UI Style Guide

Closes #2251 (closed)