[Feature Request] Add overloads with CancellationToken parameter to async methods.

[S-Luiten]

Is your feature request related to a problem? Please describe.
I'd like to add a timeout to GetHTML using a CancellationTokenSource. However, this method does not take a CancellationToken.

Describe the solution you'd like
An overload for GetHTML and other async methods which takes a cancellationToken parameter and passes it to jsRuntime.InvokeAsync.

Describe alternatives you've considered
Due to requiring a reference to the private field QuillElement, I'm currently forced to use reflection to get this reference, and manually call jsRuntime.InvokeAsync.

[ADefWebserver]

I will consider a PR for this.