Add get_edges_under_consolidation Function

[MariusWirtz]

Useful when synchronizing sub hierarchies between instances

Fixes #915

[Kevin-Dekker]

Would it be a problem if the edges order deviates? Check the below test case:

def test_get_edges_under_consolidation_remove_read(self):
       edges = self.tm1.dimensions.hierarchies.elements.get_edges_under_consolidation(
           self.dimension_name,
           self.hierarchy_name,
           "All Consolidations",
           max_depth=99)
       h = self.tm1.hierarchies.get(self.dimension_name, self.hierarchy_name)
       h_original = copy.deepcopy(h)

       h.remove_all_edges()
       for edge, weight in edges.items():
           h.add_edge(edge[0], edge[1], weight=weight)

       self.assertEqual(h_original, h)

[MariusWirtz]

Would it be a problem if the edges order deviates? Check the below test case:

def test_get_edges_under_consolidation_remove_read(self):
       edges = self.tm1.dimensions.hierarchies.elements.get_edges_under_consolidation(
           self.dimension_name,
           self.hierarchy_name,
           "All Consolidations",
           max_depth=99)
       h = self.tm1.hierarchies.get(self.dimension_name, self.hierarchy_name)
       h_original = copy.deepcopy(h)

       h.remove_all_edges()
       for edge, weight in edges.items():
           h.add_edge(edge[0], edge[1], weight=weight)

       self.assertEqual(h_original, h)

I think you identified a problem in the __eq__ function of the Hierarchy / TM1Object class.
If we change the last line of the suggested test to: self.assertEqual(h_original.edges, h.edges), it succeeds.
I will include the modified test