Refactor binomial to binary in tests/ and csep.core/binomial_evaluations.py

[wsavran]

To avoid confusion, we should refactor TestBinomialLikelihood in tests/test_evaluations.py to TestBinaryLikelihood and the module name binomial_evaluations.py to binary_evaluations.py.

This will require changing any imports to other modules and in the __init__.py. Recommended to use an IDE to refactor this to find all usages.