Feat: Add Green Anaconda Optimization (GAO) algorithm implementation

[cerrn]

Hello,

I have implemented the Green Anaconda Optimization (GAO) algorithm based on the paper:
"Green Anaconda Optimization: A New Bio-Inspired Metaheuristic Algorithm for Solving Optimization Problems" by Dehghani et al. (2023).

Changes:

• Added "OriginalGAO" class in "mealpy/bio_based/GAO.py"
• Updated "mealpy/bio_based/init.py" to include the new algorithm.

Validation:

• Implemented standard Equations (Phase 1: Mating, Phase 2: Hunting).
• Tested locally with Sphere function and verified convergence using FloatVar bounds.

Best regards.