[Services] Export client-base-reactors as CMake Project
Summary: Needed for backup and blob service
Test Plan: Run test plan from https://phab.comm.dev/D4494
Reviewers: karol, max, atul
Reviewed By: atul
Subscribers: ashoat, tomek, adrian, atul, karol, abosh
Differential Revision: https://phab.comm.dev/D4491