Create plugins for interacting with multimedia in AI

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Created Generate Image CKEditor plugin.
Added operation_type to the plugin definition and updated the AIWriter JavaScript handler to handle image responses when operation_type = text_to_image.

This enables generating images from selected text via AI. Ready for review.

I have tested the fix.
The generate image plugin is available in AI Tools plugins and on enable it appears in ckeditor.
But when I select the text and use the generate image plugin in ai assistant, the text appears in selected text. On generate image button click image is not created and a console error is thrown.

Discussed after discussing with @riyas_nr over slack and retesting the changes with OpenAI - dall-e-2 provider the image generation is done successfully. attaching the screenshot.