[services] Tests - Backup - Initialize performance tests

Summary:
Depends on D4585

Initializing performance tests for the backup service. This just generates the data to be sent and sets up a basic structure of the code

Test Plan:

cd services
yarn run-performance-tests backup 1

This should compile but it will not do anything really.

Reviewers: tomek, varun

Reviewed By: tomek

Subscribers: ashoat, tomek, adrian, atul, abosh

Differential Revision: https://phab.comm.dev/D4631