Mongo Service
    class MongoService
Contains all the functions in order to use MongoDB Database.
Functions
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                  Connects to a specific database. If there is no database with the input name in the mongo instance, an empty one will be created.
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                  Creates a collection inside the Mongo database. If there is already a collection with the parameter name,
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                  Send the created document to the Mongo collection.
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                  Requires an active instance of MongoDB at the given uri.
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                  Close the connection with the Mongo instance.