Pool loggers

[martincostello]

Pool the created instances of XUnitLogger for each category.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (b92646b) to head (d212393).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #765      +/-   ##
==========================================
+ Coverage   97.78%   97.80%   +0.01%     
==========================================
  Files          15       15              
  Lines         271      273       +2     
  Branches       37       36       -1     
==========================================
+ Hits          265      267       +2     
  Misses          3        3              
  Partials        3        3              

Flag	Coverage Δ
linux	97.06% <100.00%> (+0.02%)	⬆️
macos	97.80% <100.00%> (+0.01%)	⬆️
windows	97.06% <100.00%> (+0.02%)	⬆️

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