tools: add update-llhttp.sh
I added a tool which allow to update llhttp in more deterministic way. It works from both releases or from a git repo (for security releases). If this land, it superseded #44136.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
I added a tool which allow to update llhttp in more deterministic way. It works from both releases or from a git repo (for security releases). If this land, it superseded #44136.