doc: expose the label_space class in the API reference

[PProfizi]

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❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
1956	2	1954	230

View the top 2 failed test(s) by shortest run time

src.ansys.dpf.core.label_space::core.label_space.LabelSpace.__init__

Stack Traces | 0.001s run time

079         obj:
080             Internal object used for advanced initialization (rarely needed by users).
081         server:
082             DPF server instance to associate with this label space.
083 
084         Examples
085         --------
086         >>> # Create a LabelSpace from a dictionary
087         >>> ls = LabelSpace(label_space={"time": 1, "zone": 2})
088         >>> print(ls)
Expected:
    {'time': 1, 'zone': 2}
Got:
    {'zone': 2, 'time': 1}

.../dpf/core/label_space.py:88: DocTestFailure

src.ansys.dpf.core.label_space::core.label_space.LabelSpace.__str__

Stack Traces | 0.001s run time

152 
153         Returns
154         -------
155         str
156             A string representation of the label space, formatted as a dictionary with sorted keys.
157 
158         Examples
159         --------
160         >>> label_space = LabelSpace(label_space={"time": 1, "node": 42})
161         >>> print(label_space)
Expected:
    "{'node': 42, 'time': 1}"
Got:
    {'node': 42, 'time': 1}

.../dpf/core/label_space.py:161: DocTestFailure

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