Provide a more flexible way to configure the ObjectMapper which used by the MongoDataImport

[antkorwin]

example of necessary configuration:

public class MongoDataImport implements DataSetImport {

     ..

    public MongoDataImport(MongoTemplate mongoTemplate) {
        ..
        this.objectMapper = new ObjectMapper();
        this.objectMapper.registerModule(new GeoJsonModule());
        this.objectMapper.registerModule(new JavaTimeModule());  !!!
    }

add an additional module in the ObjectMapper