Add TCP Echo Server example

[Finomnis]

Fixes #95.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.30%. Comparing base (af42b44) to head (69cf765).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   97.45%   97.30%   -0.15%     
==========================================
  Files          15       15              
  Lines         669      669              
  Branches      669      669              
==========================================
- Hits          652      651       -1     
  Misses          3        3              
- Partials       14       15       +1     

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