Add 2D guess bounds

[stephenworsley]

🚀 Pull Request

Closes #6097

[codecov]

Codecov Report

❌ Patch coverage is 95.58824% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.15%. Comparing base (3d16556) to head (734247f).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/iris/analysis/_grid_angles.py	95.52%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6799      +/-   ##
==========================================
+ Coverage   90.13%   90.15%   +0.01%     
==========================================
  Files          91       91              
  Lines       24957    25024      +67     
  Branches     4684     4695      +11     
==========================================
+ Hits        22496    22560      +64     
- Misses       1683     1685       +2     
- Partials      778      779       +1     

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