feature/datasets - add scavenger example dataset

[lenarddome]

Dataset loading functions updates:

• cpm/datasets/base.py: Modified the load_bandit_data function to update column names and added a new function load_risky_choices to load the risky choices dataset.

Test cases for dataset loading functions:

• test/datasets/test_datasets.py: Added test cases for load_csv, load_bandit_data, and load_risky_choices functions using pytest and unittest.mock for mocking file existence and pandas.read_csv behavior.

New dataset addition:

• cpm/datasets/data/risky_choices.csv: Added a new CSV file containing the risky choices dataset.

[Copilot]

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cpm/datasets/base.py:50

• [nitpick] Consider rephrasing 'this variable is clutter' to clearer, more formal language for improved readability.

        - `index`: variable to identify each row - this variable is clutter.