Scalar or pint multiplier for SingleTimeSeries class

[KapilDuwadi]

For example:

    start = datetime(year=2020, month=1, day=1)
    resolution = timedelta(hours=1)
    length = 8784
    variable_name = "active_power"
    data = range(length)
    ts = SingleTimeSeries.from_array(
        data=data, variable_name=variable_name, initial_time=start, resolution=resolution
    )
   ts_new = 2 x ts

[KapilDuwadi]

This feature allows user to create new copy of time series data by simply multiplying object with scalar or pint quantity.