Code block: add core/paragraph in transforms object

[amustaque97]

Fixes: #38288

Description

Add core/paragraph in order to support block transformation

Testing Instructions

1. Checkout to the PR and build the project
2. Create/edit a post
3. Add paragraph block and write some text
4. click on transform
5. select transform to code
6. Validate existing paragraph block will be converted to code block

Screenshots

Types of changes

Enhancement

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
• I've updated related schemas if appropriate.

[Mamaduka]

It works as expected. Thanks, @amustaque97.

[paaljoachim]

What a nice surprise! Thank you for tackling this @amustaque97 !
It is much appreciated!