[Preemptive] migrate to flutter_map 3
IMPORTANT: This depends on rorystephenson/flutter_map_marker_popup#51 final version is not in place!!
fleaflet/flutter_map#1333
@MooNag I don't see an open PR in flutter_map. What does this PR accomplish? I see lots of refactoring. Aside of that what is new? An explanation would be perfect. Also they are looking for maintainers if you are interested.
EDIT: I saw https://github.com/fleaflet/flutter_map/pull/1333 just now :)
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Commenting to remove stale tag
@lpongetti Hi. Can you please accept this PR? @MooNag thanks for this btw :)
Please merge this :)