Modify get_overview to support duplicate names and provide a simplify…

[paulnoirel]

This is a fix for the new get_overview() method.
It now supports the use of duplicate names for reviews and uses "total" instead of "all" following feedback from QA (https://labelbox.atlassian.net/browse/PLT-1012).

There is now an optional parameter to only display the details of the queues when needed:

# Default behaviour
overview = project.get_overview()
print("Output type:", type(overview).__name__)
print(overview.dict())

Result:

Output type: ProjectOverview
{'to_label': 1619, 'in_review': 1757, 'in_rework': 162, 'skipped': 0, 'done': 45844, 'issues': 0, 'labeled': 47764, 'total_data_rows': 49383}

With the details:
In this mode, "in_review" and "in_rework" are a dictionary with the list of the queues (data) with the associated number of data rows, and the total number of data rows.

overview = project.get_overview(details=True)
print("Output type:", type(overview).__name__)
print(overview.dict())

Result:

Output type: ProjectOverviewDetailed
{'to_label': 1619, 'in_review': {'data': [{'April review - Douglas': 0}, {'April review - Joyce': 13}, {'May reviews - Daisy': 0}, {'April review - Sam': 22}, {'April review - Wafula': 12}, {'April/May review - Lilian': 556}, {'April review - kelvin': 0}, {'April/May review - Charles': 0}, {'April review - Samuel': 3}, {'April/May review - Wakairu': 1151}], 'total': 1757}, 'in_rework': {'data': [{'Rework (all rejected)': 162}], 'total': 162}, 'skipped': 0, 'done': 45844, 'issues': 0, 'labeled': 47764, 'total_data_rows': 49383}

[adrian-chang]

Great work @paulnoirel. Let's merge in once tests are green (I reran).