average_data can be imported from qiskit.quantum_info.analysis (#3159)
average_data can be imported from qiskit.quantum_info.analysis (#3159)

* made it easier to import average_data

* changed  average_data import

* Update __init__.py

* Update __init__.py

QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py