* metadata addon works

* Add code for metadata server image and makefile rules

* remove log message

* update to work with v1.13.11

* update readme

* fix metadata addon stuff for newer codebase

* buncha changes

* just so many changes

* ch-ch-ch-ch-changes

* addon works

* update readme

* boilerplate

* revert unrelated change

* move server code to another repo

* switch addon name to gcp-auth

* metadata -> gcp-auth

* missed one

* automate finding of credentials

* remove unnecessary comment

* address comments

* Update README.md

* Update README.md

* use mustload everywhere

* swap selector condition

* upgrade kube-webhook-certgen to 1.3

* move paths to constants

* add notice to user on addon enable

* adding addon documentation

* move addons documentation inside handbook

* remove old addons docs location
Co-authored-by: NPriya Wadhwa <priyawadhwa@google.com>