[services] Backup - Prepare for communication with Blob

Summary:
Depends on D3461

Creating a network for the local environment and adding a blob proto file to the backup service so we can create a blob client in the backup service.

Test Plan:

cd services
yarn run-backup-service

Reviewers: palys-swm, jimpo, varun, geekbrother

Reviewed By: palys-swm, jimpo

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

Differential Revision: https://phabricator.ashoat.com/D3462