Add switch for toggling deepcopy off

[danlessa]

I made use of the additional_objs on the codebase so that we can turn deepcopy off. The usage is as follows:

exp = create_experiment()
mode = ExecutionMode().local_mode
exec_context = ExecutionContext(mode, additional_objs={'deepcopy_off': True})
executor = Executor(exec_context=exec_context, configs=exp.configs)
(records, tensor_field, _) = executor.execute()

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