Add support for Flutter Web

[hiasr]

Is your feature request related to a problem? Please describe. Hi, I was trying to use the widget for my Flutter Web application and it didn't work because of webview errors.

Describe the solution you'd like A clear and concise description of what you would like to happen. Maybe it is possible to modify the application so it can be used cross platform easily.

[sergiofigueras]

Hello there guys!

Is there any ETA for it, please?

[arlucio]

This would be great!