migrate/remove swoole

[brettmc]

contrib/swoole has been moved into the contrib repo: https://github.com/open-telemetry/opentelemetry-php-contrib

[codecov]

Codecov Report

Merging #871 (eeafe51) into main (904da75) will increase coverage by 1.01%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #871      +/-   ##
============================================
+ Coverage     79.81%   80.82%   +1.01%     
+ Complexity     2035     2005      -30     
============================================
  Files           268      264       -4     
  Lines          5271     5205      -66     
============================================
  Hits           4207     4207              
+ Misses         1064      998      -66     

Flag	Coverage Δ
7.4	80.30% <ø> (+0.99%)	⬆️
8.0	80.80% <ø> (+0.99%)	⬆️
8.1	80.94% <ø> (+1.00%)	⬆️

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