Implement dart class models instead using dynamic types and Maps

[icodelifee]

This is a breaking change that introduces Dart Class models to this package.
Using dynamic types are prone to bug and its easier to use Dart class models instead of Maps

I have done my best to refactor the required changes for this feature.
There aren't changes internally that would change the behavior of this package.

Please let me know if there are any changes required.
Thanks

[AAkira]

Thanks!! @icodelifee
I've always wanted to make the same change.

[JulianBissekkou]

Great PR, can we get this merged @hiennguyen92 ?

[stefanschaller]

Would love to see this in the next version. @hiennguyen92

[booooohdan]

@hiennguyen92 please, do something or grant access to another contributor if you don't work on this package

[ozalisky]

@hiennguyen92 please, do something or grant access to another contributor if you don't work on this package

You always can fork the package and work on it yourself. What's the point to spam here?

[hiennguyen92]

thanks you.