feat: adding metric prefix config when multiple prometheus metric reg…

[Abdulsametileri]

If one application uses multiple kafka konsumer instances, they cannot use Prometheus metrics because they have collusion, their names are same. To prevent this kind of situation, we enable a metricPrefix config.

In prometheus, it is not possible to register exact two metrics. Prometheus gives panic: duplicate metrics collector registration attempted error message.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (f5d385a) 36.89% compared to head (e5deb08) 38.54%.

Files	Patch %	Lines
consumer_base.go	0.00%	7 Missing ⚠️
collector.go	66.66%	3 Missing ⚠️
consumer_config.go	0.00%	3 Missing ⚠️
batch_consumer.go	0.00%	2 Missing ⚠️
consumer.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v2      #86      +/-   ##
==========================================
+ Coverage   36.89%   38.54%   +1.65%     
==========================================
  Files          19       19              
  Lines         702      716      +14     
==========================================
+ Hits          259      276      +17     
+ Misses        436      433       -3     
  Partials        7        7              

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