Improve type definition for onChange of form components

[dattebayorob]

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https://codesandbox.io/s/qjx332qq4

Current behavior

The type definition of Dropdown omits the target object sent with onChange event.

Expected behavior

Dunno if it's purposeful, but for typescript users the target seens more natural ( event.target )

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]

[cagataycivici]

target is there for form libraries like formik.