Add support for remotely loaded images in RMF

[catalinradoiu]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1211724162604201/task/1212056917830137?focus=true

Description

This PR adds support for loading remote images in the RMF components. It implements:

• Updated MessageCta to handle image URLs and display them using Glide
• Created a RemoteMessageImagePrefetcher to preload remote images for better performance
• Updated the RemoteMessage model to include imageUrl field in various content types
• Modified UI layouts to accommodate remote images with proper transitions

Steps to test this PR

Remote Image Loading

• Verify that remote images load correctly in RMF components (modal and NTP)

UI changes

NTP	Modal

The image that was loaded is taken from https://staticcdn.duckduckgo.com/remotemessaging/illustrations/image.png

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Note

Introduces remote image loading and caching for Remote Messaging Framework (RMF).

• Add imageUrl to multiple RemoteMessage.Content types and propagate via JSON and app/impl mappers
• Render remote images with Glide in MessageCta and Cards List modal; fall back to existing drawables/animations
• Update layouts (view_remote_message_cta.xml, view_promo_message_cta.xml, view_cards_list_remote_message.xml) to include remote ImageViews and barriers
• Implement RemoteMessageImagePrefetcher (Glide-based) and prefetch evaluated message images in RealRemoteMessagingConfigProcessor; wire via DI
• Add Glide dependencies to design-system and remote-messaging-impl modules
• Extend tests/fixtures to cover imageUrl mapping and prefetch behavior

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[catalinradoiu]

• Add support for remotely loaded images in RMF #7445 👈 (View in Graphite)
• develop

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