Expand hashing functionality

[henrikfo]

Feature

Desired Behavior / Functionality

Expand the hashing functionality to make leakpro have fewer unintentional erroneous processes, e.g. reusing old models and objects when not intended.
_filter() function in shadowmodelhandler should support hashing functionality, And not only account for "training_data_fraction" and "model_class" when deciding if to retrain a shadow model.

What Needs to Be Done

Implement hashing support and expand meta_check_values.

How Can It Be Tested

Tests should be constructed to vary parameters that effect auditing objects and results such as target models, shadow models etc. and find that leakpro will not reuse previously create objects that is no longer valid.