Storybook: Add stories for ImageSizeControl Component

[SainathPoojary]

related to #67165

What?

Added a Storybook story for the ImageSizeControl component. This story includes documentation for props and a default example with adjustable image dimensions and size options.

Why?

• To provide clear visual documentation for the ImageSizeControl component.
• To enable interactive testing for various ImageSizeControl scenarios.
• To enhance the development experience for Block Editor components.

Testing Instructions

1. Run npm run storybook:dev
2. Open Storybook at http://localhost:50240/
3. Verify that the story renders correctly with the default settings.
4. Test onChange and onChangeImage callbacks by observing console actions.
5. Ensure all documented props work as intended.

Screenshots or screencast