tests and benchmark for baggage parsing

[brettmc]

Closes #447

[codecov]

Codecov Report

Merging #873 (e1bf8f1) into main (904da75) will increase coverage by 0.48%.
The diff coverage is 0.00%.

❗ Current head e1bf8f1 differs from pull request most recent head 9ea88e6. Consider uploading reports for the commit 9ea88e6 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #873      +/-   ##
============================================
+ Coverage     79.81%   80.29%   +0.48%     
+ Complexity     2035     2034       -1     
============================================
  Files           268      268              
  Lines          5271     5269       -2     
============================================
+ Hits           4207     4231      +24     
+ Misses         1064     1038      -26     

Flag	Coverage Δ
7.4	79.79% <0.00%> (+0.48%)	⬆️
8.0	80.29% <0.00%> (+0.48%)	⬆️
8.1	80.43% <0.00%> (+0.48%)	⬆️

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Impacted Files	Coverage Δ
src/API/Baggage/Metadata.php	0.00% <0.00%> (ø)
src/API/Baggage/Propagation/Parser.php	100.00% <ø> (+100.00%)	⬆️
src/Context/Context.php	82.05% <ø> (ø)

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