Add type overload for __getitem__

[Thijss]

In projects that use power-grid-model-ds as a dependency, I noticed that the type inferred by pyright when using e.g.node_array['id'] is NodeArray, whereas NDArray[int] is expected.

This change seems to fix that, while I don't really understand why:

Reason I don't fully understand it:

If I change

    @overload
    def __getitem__(self: Self, item: str | list | tuple) -> NDArray[Any]: ...

to:

    @overload
    def __getitem__(self: Self, item: str | list | tuple) -> None: ...

(or any other output type)

then:
pyright is also happy...

Also in both cases (with and without this PR)
reveal_type(node['id']) results in np.ndarray

Seems strange to me...

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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