feat!: rename ml model params

[GarrettWu]

Includes following changes:

• renaming min_rel_progress -> tol, to be consistent with sklearn
• not allowing setting early_stop anymore, always to True
• renaming n_parallell_trees -> n_estimators, to be consistent with sklearn
• renaming class_weights -> class_weight, to be consistent with sklearn
• renaming learn_rate -> learning_rate, to be consistent with sklearn
• PCA n_components supports float value and None now, default to None

BEGIN_COMMIT_OVERRIDE
feat!: rename various ml model parameters for consistency with sklearn (#491)

feat!: rename model parameter min_rel_progress to tol
fix!: early_stop setting no longer supported, always uses True
feat!: rename model parameter n_parallell_trees to n_estimators
feat!: rename class_weights to class_weight
feat!: rename learn_rate to learning_rate
feat!: PCA n_components supports float value and None, default to None
END_COMMIT_OVERRIDE