Added an HTTP server example using C++20 coroutines

[anarthal]

Contributes to #365

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (829dbf7) to head (9cfb36b).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #385   +/-   ##
========================================
  Coverage    98.95%   98.95%           
========================================
  Files          142      142           
  Lines         7188     7188           
========================================
  Hits          7113     7113           
  Misses          75       75           

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