[BE] Cross-Instance Feed Viewing #1928

Requirements

• [X] This is a feature request and not a bug report. Otherwise, please create a new bug report instead.
• [X] Please check to see if this request (or a similar one) already exists.
• [X] It's a single feature. Please don't request multiple features in one issue.

Describe the feature you'd like

It would be great to have the ability to view the feed of another instance directly from the instance I'm using. This feature would enhance the user experience by allowing us to explore and engage with content from different instances without having to visit each single community or switch between instances manually.

Originally posted by 8ullyMaguire in #1928