[AND-442] [AND-107] Improve the image loading

[andremion]

🎯 Goal

Fix the loading glitches of image components.

🛠 Implementation details

• Skip the empty state of the first rememberAsyncImagePainter emission, so that we reduce the number of transitions between loading and loaded states.
• Give time for login activity to start before disconnecting the user so we prevent showing disconnected states on Compose sample.
• Replace StreamImage with StreamAsyncImage.
• Remove unused landscapist dependencies.
• Deprecate landscapist image functions in favor of Coil ones.
• Create snapshot tests for the affected components (Except for the MediaGalleryPreviewActivity components, which require a big refactor first)

🎨 UI Changes

Avatar components

Before	After
avatar.before.webm	avatar.after.webm

Media components

Before	After
media.attach.before.webm	Screen_recording_20250414_085345.webm

🧪 Testing

Explore every screen that shows images such as the channel list, message list, attachment picker, and gallery screens.

🎉 GIF

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	3.16 MB	3.16 MB	0.00 MB	🟢
stream-chat-android-offline	3.38 MB	3.38 MB	0.00 MB	🟢
stream-chat-android-ui-components	7.89 MB	7.89 MB	0.00 MB	🟢
stream-chat-android-compose	9.90 MB	9.91 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate failed

Failed conditions
53.7% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud