Introduce 07-independentset

[ahao27]

Description

Introduces 07-independentset. Running ommx_create.py right under 07-independentset/models/binary_linear creates .ommx files.

Other Info

For now, The ommx files is not in this PR due to the size isuue.

[Copilot]

Pull Request Overview

This PR introduces a new independent set optimization problem directory (07-independentset) with comprehensive modeling implementations and solution data.

• Adds complete problem directory structure for maximum independent set optimization
• Implements two modeling approaches: binary linear (with constraints) and binary unconstrained (QUBO)
• Provides extensive solution files and documentation for various graph instances

Reviewed Changes

Copilot reviewed 72 out of 96 changed files in this pull request and generated 6 comments.

File	Description
07_independentset/solutions/*.sol	Solution files in various formats for different graph instances
07_independentset/solutions/README.md	Documentation of solution results with comparison to literature
07_independentset/models/binary_unconstrained/*	QUBO formulation model and utilities
07_independentset/models/binary_linear/*	Linear constrained model and utilities

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[ksk-jij]

I've put some comments. Please have a look. Also, this time, I didn't execute any pf files since my machine is currently working for other stuff. Please make sure those work well :)

[ksk-jij]

Thank you for the update! Looks good to me. I'll sort the directory structure to align with the current main and remove unnecessary solutions.