[utils] Improve `traverse_obj`
* Allow skipping a level: `traverse_obj([{k:v1}, {k:v2}], (None, k))` => `[v1, v2]` * Make keys variadic: `traverse_obj(obj, k1: str, k2: str)` => `traverse_obj(obj, (k1,), (k2,))` * Fetch from multiple keys: `traverse_obj([{k1:[1], k2:[2], k3:[3]}], (0, (k1, k2), 0))` => `[1, 2]` TODO: Add tests
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