[Misc] Support more collective_rpc return types #25294
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Signed-off-by: Nick Hill <nhill@redhat.com>
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This pull request generalizes the serialization of collective_rpc return types to support arbitrarily nested lists and dictionaries, which is a valuable enhancement. The core logic is implemented through new recursive encoding and decoding functions in vllm/v1/serial_utils.py, and the changes are well-covered by new tests. My review includes suggestions to improve the robustness of the deserialization logic by adding assertions to guard against potential data mismatches, which could lead to silent errors.
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Generalization of #21845, support arbitrarily nested combinations of dicts and lists in returned types.
This is needed for #18465.