Migrate to a Federated Plugin

[renefloor]

Is your feature request related to a problem? Please describe.
Currently the plugin always has all dependencies, but chooses on runtime which maps plugin it will use. This means that we still have the Google Maps dependency in iOS.

Describe the solution you'd like
If we create a federated plugin, for example like geolocator or in_app_purchase we can only include those dependencies that are relevant for the platform and we could also allow others to create other platform versions, for example for flutter_map or huawei maps.

Describe alternatives you've considered

Additional context
https://docs.flutter.dev/packages-and-plugins/developing-packages#plugin

[mminhlequang]

that correctly