[native] Add message search screen

Summary:
issue: https://linear.app/comm/issue/ENG-3163/create-the-search-screen-for-message-searching
Creating a screen that will display results of message search, or "Your search results will appear here!" message

Test Plan: Opened the screen, checked that it displays correctly

Reviewers: bartek, kamil, kuba, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7773