Add Light Spectrum Optimizer (LSO) to physics_based

[AhmetYP]

Description

This PR adds the Light Spectrum Optimizer (LSO) algorithm to the physics_based group.

Reference

Abdel-Basset, M., Mohamed, R. (2022). Light Spectrum Optimizer: A Novel Physics-Inspired
Metaheuristic Optimization Algorithm. Mathematics, 10(19), 3466.
DOI: https://doi.org/10.3390/math10193466

Changes

• Added LSO.py to mealpy/physics_based/
• Added OriginalLSO class - original implementation from paper
• Added DevLSO class - developed/simplified version
• Added test file tests/physics_based/test_LSO.py
• Updated __init__.py files for proper imports

Parameters

• Ps (float): probability of scattering stages, default = 0.05
• Pe (float): controlling parameter for scattering stages, default = 0.6
• Ph (float): probability of boundary handling methods, default = 0.4
• B (float): exploitation probability, default = 0.05