Refactor Sensitivity Analysis Workflow

[debpal]

This pull request includes:

• Introduced a refreshed version of the SensitivityAnalyzer class.
• Shortened class and type names in types.py for clarity. New names are BaseDict, ModifyDict, BoundDict, ModifyType, and BoundType.
• Removed the function in utils.py that generated parameter names with a security key. Parameters with multiple occurrences are now suffixed with a counter, while single occurrences remain unchanged.
• Added a function in validators.py to ensure the input list of dictionaries does not contain duplicates. This is applied in both run_swat and simulation_by_sobol_sample.
• Updated documentation to match the modified code. Removed the sections on parallel computation in SWAT+ simulation and the custom sensitivity analysis workflow, as they were confusing.
• In the DataManager class, simulated_timeseries_df now uses utils._load_file. The FileReader class is no longer imported elsewhere in pySWATPlus.