prefer_for_elements_to_map_fromiterable

Use 'for' elements when building maps from iterables.

The analyzer produces this diagnostic when Map.fromIterable is used to build a map that could be built using the for element.

The following code produces this diagnostic because fromIterable is being used to build a map that could be built using a for element:

void f(Iterable<String> data) {
  Map<String, int>.fromIterable(
    data,
    key: (element) => element,
    value: (element) => element.length,
  );
}

Use a for element to build the map:

void f(Iterable<String> data) {
  <String, int>{
    for (var element in data)
      element: element.length
  };
}

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