Tabs enhancement

[jiangyh1024]

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Current behavior
Expected behavior
Can you add horizontal scroll bar when there are many tabs like NgZorro does instead of put them to the next line ?

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 5.X

• PrimeNG version: 5.X

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Language: [all | TypeScript X.X | ES6/7 | ES5]

• Node (for AoT issues): node --version =

[JacobSiegle]

Duplicate of #5550