DataFetcherConstructor args constructor as the annotation + tests

[danieltaub96]

@GraphQLDataFetcher have args (String[]) fields, and the class thats implements DataFetcher should expect to get those args with String[] constructor... of course that it's have Backwards compatibility wrote some tests for the DataFetcherConstructor class

[yarinvak]

Please udpate the readme with all the possible options of how the constructor of datafetche can look like

[danieltaub96]

done