Add calibrated real-world model to Examples module

[sschlenkrich]

This PR adds a hybrid model to the Examples module. The hybrid model is calibrated to match volatilities and correlations observed from historical time series of interest rates and exchange rates.

Calibration methodology is implemented and documented here. Historical time series data are documented here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.32%. Comparing base (93dc264) to head (ef3d108).

Additional details and impacted files

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  Coverage   98.32%   98.32%           
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  Files          74       74           
  Lines        3942     3942           
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  Hits         3876     3876           
  Misses         66       66           

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