Missing History Method Overloads

Expected Behavior

• QCAlgorithm.History method has integer and TimeSpan overloads that include a DataNormalizationMode parameter. These methods will be used to request scaled raw data (DataNormalizationMode.ScaledRaw).
• QCAlgorithm.History method has an overload that returns IEnumerable<Slice> for Python algorithms. These method allow us to request Slice data without the conversion to pandas.Dataframe.

Actual Behavior

• To request DataNormalizationMode.ScaledRaw data, we need to use the DateTime/DateTime overload that requires the start time of the history request.
• We cannot get Slice data in Python algorithms, since the available overloads convert the data to pandas Dataframe.

Potential Solution

N/A

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues
• I have provided detailed steps to reproduce the issue

Start at the QCAlgorithm.History overloads and inspect how DataNormalizationMode and Python algorithm calls are exposed. Done means integer and TimeSpan overloads accept the requested normalization mode, and Python algorithms can request IEnumerable without conversion to a pandas DataFrame.