Add support for pasting images into composer text input

[anh-ngquang]

🔗 Issue Link

N/A

🎯 Goal

Allow pasting images into composer text input, which is a common feature in messaging apps.

🛠 Implementation

Allow paste action on InputTextView, and call a closure named onImagePasted to pass the pasted image up to the MessageComposerView, then handle the image with the imagePasted method on MessageComposerViewModel, which save the image to a local temporary file, create a new AddedAsset and insert it to the addedAssets array.

🧪 Testing

Copy an image into the clipboard and paste into message composer text input. The image should be added into the composer view the same way as choosing an image from Photo library.

🎨 Changes

Screen.Recording.2025-02-12.at.16.41.13.480.mov

☑️ Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Affected documentation updated (docusaurus, tutorial, CMS (task created)

[nuno-vieira]

@anh-ngquang Thanks for the PR 👍 The implementation will probably require some changes because this is a breaking change. We will take it from here once we have time. We are planning on working on this in the next sprint.

[nuno-vieira]

New PR without breaking changes available here: #797