benchmark: add code to use roles in exchange benchmark
benchmark test can now "easily" use the new role information. A `BaseExchangeTimeSuite` subclass can use the `role_action` and `role_subtype` to declare the role the class is using. Then decorate the class with `@setup_role` to make sure the parameters variants are properly set. Finally the appropriate data can we accessed through the `role_data` property.
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