[native] Render the media gallery in the thread settings on native

Summary:
This diff handles actually displaying the media gallery component from the previous diff into the thread settings on native.

https://linear.app/comm/issue/ENG-2869/render-the-media-gallery-in-the-thread-settings-on-native

Depends on D6466

Test Plan:
As mentioned in the previous diff, I've hard coded some images into the component to check how the component renders with images. Displayed below is the screenshot.

Reviewers: atul, ginsu, kamil, tomek, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D6467