Remove one copy of OptimizedTermSetPairwiseComparison class

[julesjacobsen]

OptimizedTermSetPairwiseComparison class is duplicated in two places:

ELDER/src/pheval_elder/prepare/core/multiprocessing/best_match_multiprocessing.py

Line 20 in 7bb2174

class OptimizedTermSetPairwiseComparison:

ELDER/src/pheval_elder/prepare/core/query/optimized_parallel_best_match.py

Line 20 in 7bb2174

class OptimizedTermSetPairwiseComparison:

To do:

[ ] - Check they are identical
[ ] - Delete one or state very clearly why there needs to be two identical copies, then think if this really needs to be the case and delete one.
[ ] - Check if there are other duplicated classes / methods, choose one copy as the once to use and delete the others.