Feature Request - Add EvaluateScriptAsync CancellationToken overload

Currently it is not possible to specify a CancellationToken for canceling the EvaluateScriptAsync task. Therefore, when executing a long-running javascript method it is not possible to cancel it.

**Describe the solution you'd like:**
Extend the WebBrowserExtensions.EvaluateScriptAsync() method with the possibility to specifiy a CancellationToken.

Locate WebBrowserExtensions.EvaluateScriptAsync and inspect its existing overloads and related cancellation handling. Add the requested CancellationToken overload and verify that a long-running JavaScript evaluation can be cancelled.

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