cleanup unused connections when load balancing mode is active

[DanielePalaia]

This closes #236

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.53%. Comparing base (ac1f614) to head (8267660).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/consumer.rs	0.00%	2 Missing ⚠️
src/producer.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
- Coverage   89.59%   89.53%   -0.06%     
==========================================
  Files          78       78              
  Lines        6658     6662       +4     
==========================================
  Hits         5965     5965              
- Misses        693      697       +4     

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[Gsantomaggio]

tested and it works!