feat: added topic exists check (#59)

[Abdulsametileri]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.85%. Comparing base (6e542f1) to head (9e667fe).
Report is 2 commits behind head on v2.

❗ Current head 9e667fe differs from pull request most recent head 4ecae0d

Please upload reports for the commit 4ecae0d to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #131      +/-   ##
==========================================
+ Coverage   48.78%   48.85%   +0.06%     
==========================================
  Files          20       20              
  Lines         783      784       +1     
==========================================
+ Hits          382      383       +1     
  Misses        390      390              
  Partials       11       11              

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[Abdulsametileri]

Add VerifyTopicOnStartup flag because of AllowAutoTopicCreation flag