Add Parallel Particle Swarm Optimizer Benchmarks

[AdityaPandeyCN]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Adds GPU PSO benchmark page comparing ParallelParticleSwarms.jl variants (SerialPSO, ParallelPSOKernel sync/async, ParallelSyncPSOKernel, HybridPSO-LBFGS) across CPU and GPU backends on Rosenbrock test problems.