Mlfin.py 0.1.2

• Add the ensemble module containing Sequential Bootstrapped Classifier.
• Add the run_bars method and structural_breaks module.
• Add the sample_weights module.
• Add the cross_validation module.
• Add correspondence tests for each module.
• Fix docstring typos and errors.
• Update documents with detailed explanations and examples.
• Fix Ci-Cd workflow to only build and publish when receiving tag push.