Add extended Attribute selection to CICIDS

[desecnd]

Currently CICIDS2017 dataset allows only for selecting 10 hardcoded attributes or full set. Dataset should probably allow for one of: a) selecting larger set of attibutes (e.g. 20) for experiment purpose

• this might be hardcoded, but should contain information about the source, e.g. same as river does with __docstring__ of algorithms

  """
  References
  -----------
  """

But if implementation will be simple hardcoded variable / dictionary, then plain comment with reference is definitely fine

b) holding attributes in order (or performing some kind of sorting?) with respect to specified paper / work.

• This is probably an overcomplicated example in our case, but will allow for calling top_n attributes, which might be helpful and interesting to test during experiments

[rswc]

Personally, I think the dataset class should accept a list of strings as a way to select attributes. For now, let's just define the attribute subsets as class constants e.g. CICIDS2017.Attributes.ALL or CICIDS2017.Attributes.YULIANTO_25.