Include Kafka based WebSubHub Sample

[ayeshLK]

Purpose

$subject

Related to #823
Related to #922

Checklist

• Linked to an issue
• Updated the changelog
  Added tests N/A

[codecov]

Codecov Report

Merging #164 (02ee6dc) into main (54750c0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   82.65%   82.65%           
=======================================
  Files           9        9           
  Lines         761      761           
  Branches      443      443           
=======================================
  Hits          629      629           
  Misses        132      132           

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