Calendar component keyboard support

[Merve7]

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[ ] bug report
[ ] feature request
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https://codesandbox.io/s/qjx332qq4

Current behavior

Expected behavior

Minimal reproduction of the problem with instructions

Please tell us about your environment:

• React version:

• PrimeReact version:

• 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]