Summary: prototool will help us run checks to determine whether or not any proto changes will break the API

Test Plan: ran the docker image, verified that i can run prototool

Reviewers: zasgar, #engineering

Reviewed By: zasgar, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D4081

GitOrigin-RevId: 0d53893ef5c67b8b724fc5f1ae3b7554b71c639f