Investigate pythonnet list flattening behavior

[ivaylo-matov]

Restore DSCore.List.Flatten functionality by ensuring non-generic Python list decodes produce nested CLR IList structures, addressing a breaking change in PythonNet 3.11.

The upgrade to PythonNet 3.11 introduced a breaking change where .NET collections and arrays are no longer automatically converted to Python collections. This meant that DSCore.List.Flatten was receiving opaque PyObjects instead of the expected CLR ILists, leading to incorrect flattening behavior. This change modifies the ListEncoderDecoder to explicitly convert nested Python lists and tuples into ArrayList structures when a non-generic IList is expected, thus restoring the pre-upgrade behavior.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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