Save Rosenbrock analytical evidence in log space

[alicjapolanska]

• Change analytical evidence file saving for Rosenbrock to log space to be compatible to be read in for plot_realisations()
• Change some hyperparameters to values that work well with the 2D case
• Change number of samples in numerical integrals in tests to get a more accurate value

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.80%. Comparing base (55c970e) to head (86e4f1f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   95.80%   95.80%           
=======================================
  Files          14       14           
  Lines        2335     2335           
=======================================
  Hits         2237     2237           
  Misses         98       98           

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