Add support for Blurhash in SmartImage

Ticket(s) / Related Merge Requests

relates to engine#1971 (closed)

closes #4035 (closed)

Summary of Changes

• a blurred version of an image should be shown before the image fully loads
• paywalled images now show a blurred version of the image instead of a default image
• these changes are only in feeds (channel, newsfeed, discovery, etc.)
• turning on data saver should now use the blurhash instead of manually blurring the images
• images and posts without a blurhash should function as before

Testing Considerations

• images in feed

Regression Scope

all feed images

Platform Affected (web, mobile, etc)

mobile

Developer Testing Completed

(What has been tested already?)

Screenshots

(Any extra UI screens that can be shared)

Does this impact

• Localization
• Dark/light mode
• Guest mode