Summary:
I keep running make gazelle and hpack keeps generating a bazel file. I feel like
we should just check one in so that we don't have stray files.

Test Plan: n/a

Reviewers: yzhao, vihang, #third_party_approvers

Reviewed By: vihang, #third_party_approvers
Signed-off-by: Phillip Kuznetsov <pkuznetsov@pixielabs.ai>

Differential Revision: https://phab.corp.pixielabs.ai/D10435

GitOrigin-RevId: d2eca15336c9085287cd59bbd43e43aebba5d1a3