add getitem and setitem to the Dataset object

[MAfarrag]

the Dataset object has two sub groups that can be iterated on the subset (of variables as in netcdf files) or the bands.

so decide which one to iterate on using the getitem and setitem, and implement it

[pyramids] pyramids/dataset.py (Lines 87-88)

self.subsets = src.GetSubDatasets()
        self._variables = self.get_variables()

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