feat: Image size in lexical editor

[jonathanbobel]

Changes proposed in this pull request:

• Added a new Image block type to the lexical editor with slug 'image' for inserting images into rich text.
• Implemented width options: Full Width, Desktop (1024px), Tablet (640px, default), Mobile (480px), Mobile Small (320px), and Custom (with user-defined width).
• Added alignment options (Left, Center, Right) that apply when width is not full.
• Included accessibility: required image upload field and optional alt text (falls back to null alt text if not provided).
• Registered the ImageBlock in the editor configuration alongside ProcessList, Accordion, and CardGrid blocks, making it available in all rich text fields.

Security considerations

None

[kevinsmaster5]

Looks good 👍