Support firebase

Hi @enchev,

I’m still playing around to find out how far I can go in RAD.
Firebase is a real time database, quick to setup, integration with auth providers, serverless functions,…
So I think very interesting to use with radzen.
If I could could implement it as a custom datasource, that would be fine also.
But for the moment I’m stuck in using extra npm packages (see other post), and using the datasource in a generated screen