chat: image attachments collection, first draft: when more than one image is attached in a message, they are collected and a dedicated attachment item is shown. Opening this item will launch the carousel with all collected images.

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="*/*" />
</intent-filter>