add a recursive option to allow only listing the entities that are direct children

[github-actions[bot]]

of the link.

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https://github.com/muni-town/weird/blob/9b0f5646e58e6a8e1d77377d45827d2ee2d137bb/leaf/leaf-protocol/src/lib.rs#L375-L382

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This issue was generated by todo-issue based on a TODO comment in 9b0f5646e58e6a8e1d77377d45827d2ee2d137bb.