Split PR #167 into wave module changes

[simmsa]

This PR takes the wave module code from PR #167 but specifically excludes short_term_extreme.m changes which are failing tests and require additional effort.

List of changes:

• wave/resource/standardize_wave_spectra_frequency.m:
  • New helper function to standardize frequency filtering and shaping for all wave resource functions
  • Uses arguments block for input validation
• wave/resource/frequency_moment.m:
  • Converted to native MATLAB
  • Uses arguments block for input validation
• wave/resource/energy_period.m:
  • Converted to native MATLAB
  • Uses frequency_moment function
  • Uses arguments block for input validation
• wave/resource/significant_wave_height.m:
  • Converted to native MATLAB
  • Uses frequency_moment function
  • Uses arguments block for input validation
• wave/resource/jonswap_spectrum.m:
  • Converted to native MATLAB
  • Uses arguments block for input validation
  • Uses standardize_wave_spectra_frequency helper
• wave/resource/pierson_moskowitz_spectrum.m:
  • Converted to native MATLAB
  • Uses arguments block for input validation
  • Now uses jonswap_spectrum with gamma=1 implementation
• wave/resource/surface_elevation.m:
  • Converted to native MATLAB
  • Uses same ifft method as MHKiT-Python
  • Uses arguments block for input validation
• examples/SWAN_example.{m, mlx, html}
  • Remove examples from input file path
• examples/wave_example.{m, mlx, html}
  • Remove examples from input file path

[MShabara]

@simmsa The PR looks good to me after review. I made minor modifications to some of the examples—if everything looks good on your end, feel free to go ahead and merge it.

[simmsa]

@MShabara sounds good! Thank you for taking a look. I just need to update the changelog and then I will merge this.