(improvement) Optimize Cython deserialization primitives and add VectorType Cython deserializer (substantial - 11x-30x speedup mainly via DesVectorType.deserialize_bytes with Cython)

(improvement) Optimize Cython deserialization primitives and add VectorType Cython deserializer (substantial - 11x-30x speedup mainly via DesVectorType.deserialize_bytes with Cython) #658