<mat-tab> Hide and Show Feature

#### Bug, feature request, or proposal:
hide/show behavior need to Provide in future release.

#### What is the expected behavior?

wanted to hide/show tab.
#### What is the current behavior?
currently you ppl are providing disabled feature so i wanted to hide/show tab.

#### What are the steps to reproduce?
provide api include hide/show feature.
#### What is the use-case or motivation for changing an existing behavior?
i need to show/hide tabs for that i need this feature instead of disabled api.

#### Which versions of Angular, Material, OS, TypeScript, browsers are affected?
i have used angular5 and Material design 5.2. please go through the below link for your reference.
https://material.angular.io/components/tabs/api

#### Is there anything else we should know?
apart from disable tab everything is working fine.

Commencez par l’Angular Material tabs API liée dans l’issue et examinez le comportement existant des onglets désactivés. Déterminez la sémantique prévue d’affichage/masquage ainsi que l’implémentation des onglets et les tests concernés ; le travail est terminé lorsque l’API et le comportement sont clairement spécifiés et couverts par des tests.

Rédigé par le modèle d'indexation à partir du texte de l'issue.