OverlayPanel: incorrect type definitions for show/hide arguments

[VsevolodGolovanov]

I'm submitting a ... (check one with "x")

[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Current behavior
Valid method calls are marked as erroneous due to typings.

The problems are...

1. Both show arguments are required and don't accept null or undefined.
2. toggle declares only the event argument, when it should have target too.

Expected behavior
Typings should allow correct calls: specifying event, but not target; and vice versa.

This goes beyong typings, but IMHO due to the XORy nature of the arguments, the best API would be one argument: eventOrTarget: SyntheticEvent | EventTarget.

Minimal reproduction of the problem with instructions

Please tell us about your environment:

• React version:
  16.13.1.

• PrimeReact version:
  4.1.2.

• 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]
  TypeScript 3.8.3.