[services] Backup - Add Tools

Summary:
Adding Tools with getCurrentTimestamp which will be needed for creating backup items.

Depends on D3158

Test Plan: Backup service builds

Reviewers: palys-swm, geekbrother, varun, ashoat, jimpo

Reviewed By: palys-swm, ashoat

Subscribers: benschac, ashoat, palys-swm, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D3159