DeviceProxy::command_history: use pybind11 caster instead of custom overload

Yury Matveevrequested to merge
improve_command_history into develop

We do not need to provide our overload for DeviceProxy::command_history - pybind11 does everything by itslef PYBIND11_MAKE_OPAQUE. In addition, if we let pybind11 to use its caster - we get proper type hints for DeviceProxy.command_history

DeviceProxy::attribute_history: improve type hints a bit. Now it is at least typing.list, not just typing.Any

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