Benchmarking function

[nicholaskl97]

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

Added benchmark function to solve a neural Lyapunov problem and record the training time and confusion matrix of the resulting classifier. Additionally fixed NeuralLyapunovPDESystem when dynamics isa ODEFunction and state_syms is provided.