feat: Enhance postprocess tool with metrics, utilities, and config updates

[samhuestis]

Pull request to add rmi_postprocess_tool folder, for comparison of multiple runs with key metrics

What's in it?

• Modules for shared calculations and specific metrics, defined in utils
• build_{metric}.py files for running specific metrics to get csv outputs
• Config.toml file to configure comparison of runs, specificy VM outputs folder, etc.
• Updates to gitignore to ignore csv outputs

What's not in it?

• Needs further documentation of process
• Single run command to run all metrics at once.
• Hourly dispatch module