Fix: linting and added __init__.py to surrogate

Author: f-allian

causal_testing/surrogate/__init__.py

@@ -1,5 +1,7 @@
 """Module containing implementation of search algorithm for surrogate search """
 # pylint: disable=cell-var-from-loop
+# pylint: disable=too-few-public-methods
+# pylint: disable=too-many-locals
 # Fitness functions are required to be iteratively defined, including all variables within.
 
 from operator import itemgetter