Make Rectangle fields final to enhance immutability

[manuelsblanco]

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Description

Make Rectangle fields final to enhance immutability.

Motivation and Context

To improve code quality.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ x] I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• [x ] All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d6bcca) 58.48% compared to head (0e4bbcd) 58.48%.

❗ Current head 0e4bbcd differs from pull request most recent head 1d91792. Consider uploading reports for the commit 1d91792 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13586   +/-   ##
=======================================
  Coverage   58.48%   58.48%           
=======================================
  Files          86       86           
  Lines        5270     5270           
  Branches      220      220           
=======================================
  Hits         3082     3082           
  Misses       1968     1968           
  Partials      220      220           

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[diemol]

Thank you, @manuelsblanco!