Warn users when setting undefined attributes in openmc.Settings

[GuySten]

Description

This PR warn users when setting undefined attributes in openmc.Settings

Fixes #3741

Example Behavior

>>> import openmc
>>> s = openmc.Settings()
>>> s.particle = 5
<python-input-2>:1: UserWarning: 'Settings' object has no attribute 'particle'. Did you mean: 'particles'?
  s.particle = 5

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)