add function to compute OTDF and evaluate outages using OTDF

[rbolgaryn]

Key Points

• makeOTDF:
  Calculates the Outage Transfer Distribution Factors (OTDF) matrix.
  Connects bus power injections to branch flows for outage scenarios.
  Inputs: PTDF matrix, LODF matrix, and outage branch indices.
  Output: OTDF matrix tailored for N-1 contingency analysis.

• outage_results_OTDF:
  Computes branch power flows for each defined outage scenario using OTDF.
  Inputs: OTDF matrix, bus power vector (Pbus), and outage branch indices.
  Output: Array of branch power flows under each outage scenario.

• Testing and Validation
  Tested against contingency analysis with pp.rundcpp

• Application
  Useful for fast contingency analysis in power systems when DC approximation is acceptable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (875a3cb) 79.30% compared to head (fa20250) 79.30%.

Additional details and impacted files

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  Coverage    79.30%   79.30%           
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  Files          255      255           
  Lines        27939    27946    +7     
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+ Hits         22156    22163    +7     
  Misses        5783     5783           

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