Fix performance regression in calculate_feature_matrix

### Fix performance regression in calculate_feature_matrix

Integration of Woodwork into Featuretools has caused an increase in time required to complete calculate feature matrix. An initial investigation suggests this increase is primarily driven by initializing Woodwork, particularly assigning new columns to the feature matrix when initializing causes a column dtype change.

This needs further investigation, and once the root cause is identified improvements should be made so that the CFM time is on par with the previous time.