[Services] Export server-base-reactors as CMake Project

Summary:
Necessary for backup service

Depends on D4491

Test Plan: Run test plan from https://phab.comm.dev/D4494

Reviewers: max, karol, atul

Reviewed By: atul

Subscribers: ashoat, tomek, adrian, atul, abosh, karol, max

Differential Revision: https://phab.comm.dev/D4492