[OptApp] Revamp Independent Analysis Execution Policy

[talhah-ansari]

📝 Description

This PR refactors the IndependentAnalysisExecutionPolicy to support customizable analysis input/output folders, HDF5 output, and value extraction.
A new GetPath method is added to the ExecutionPolicy interface and implemented across all derived execution policies.
A utility context manager for working directory scoping is also added.

🆕 Changelog

• Added an abstract GetPath method to the ExecutionPolicy base class, requiring all execution policies to expose their execution directory as a Path object. Implemented this method in all subclasses, returning the appropriate path for each (independent_analysis_execution_policy.py, kratos_analysis_execution_policy.py, stepping_analysis_execution_policy.py).
• Refactored IndependentAnalysisExecutionPolicy to accept and process new settings for input/output folders, project parameters, and HDF5 output, including dynamic path resolution and value extraction from the optimization problem. Added logic to copy input files, write HDF5 files, and instantiate the analysis with the correct parameters.
• Introduced a WorkFolderScope context manager to temporarily change the working directory and Python path, used for executing analyses in the correct context.
• Updated tests to cover the new GetPath interface and the enhanced execution policy logic. Added a sample orchestrator_parameters.json file for test use.