[backup] Basic http server

Summary:
ENG-4501

Backup will be now an http server so adding basic http server.

Depends on D8881

Test Plan: cargo run, navigate to localhost:51002/hello and check if it returns world

Reviewers: bartek, kamil, patryk, jon

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8882