Cache font widths on Font property as it will be called for every text element

[PrinsFrank]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.19%. Comparing base (342f5e6) to head (2d779b0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Document/Object/Decorator/Font.php	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #250      +/-   ##
============================================
- Coverage     52.23%   52.19%   -0.04%     
- Complexity     1641     1642       +1     
============================================
  Files            98       98              
  Lines          2979     2981       +2     
============================================
  Hits           1556     1556              
- Misses         1423     1425       +2     

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