Add API details GEP-3779 - E/W Authorization (#3891)

* add api details gep-3779

* fmting

* some-fixes

* some-fixes

* add Namespace wide section and more clarifications

* add clarifications and link to google doc for targetRef

* more feedback

* more feedback

* add feedback and agreements from meeting

* formatting

* add guardrails

* organize the GEP

* remove l7 and deny language from the gep

* flynns feedback

* clarify whats being targeted in a namespace-wide policy

* Apply suggestions from code review

Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>

* feedback from kubecon

* more feedback

* added label selector in GEP-713 as a graduation criteria

Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>

* Update geps/gep-3779/index.md

Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>

* Update geps/gep-3779/index.md

Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>

* add enforecementLevel to the API and ports clarifications

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Co-authored-by: Mike Morris <mikemorris@users.noreply.github.com>

Author: LiorLieberman