[services] Extract cors config to services-lib

Summary:
ENG-4501
Backup service will be now a http servce so it will need a cors config. This diff extracts it from blob to services lib.

Depends on D8869

Test Plan: cargo build in blob

Reviewers: bartek, kamil, patryk, jon

Reviewed By: bartek, jon

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8881