Avoid pickling primitive values and proto messages #179
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chriso
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This PR updates the SDK to avoid using pickle to serialize inputs and outputs unless necessary.
If an input or output value is a protobuf message, it's now serialized directly.
If an input or output value is primitive (null, boolean, integer, float, string, bytes, timestamp, duration), we serialize it using one of the built-in protobuf wrappers.
If an input or output value is a JSON-like list or dict, we serialize it using the built-in structpb wrappers.