<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.

Comienza con la Angular Material tabs API enlazada en el issue e inspecciona el comportamiento existente de las pestañas deshabilitadas. Determina la semántica prevista de ocultar/mostrar y la implementación y las pruebas de pestañas afectadas; el trabajo estará terminado cuando la API y el comportamiento estén claramente especificados y cubiertos por pruebas.

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