Support pasting images into Editor Lite
Similar to #22822 (closed) (relevant MR: !33256 (merged)) we should be considering support for adding images into Editor Lite (Snippets, files in repos, etc.).
Since the Editor Lite is used in different setups and might communicate with different backends (REST or GraphQL), it is suggested to not dive into the actual file upload implementation here, but instead, provide a stable API on the editor that could communicate about pasting the images to the subscribers. Implementing the handlers in the subscribers should not be part of this Issue.