feat: expose log function

[aymanbagabas]

Exposing logger.Log makes it possible to use a custom log level to log messages. Simply define a new level and use Log and Logf to log messages using the newly defined level.

Fixes: #89

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (595fffe) 80.16% compared to head (df1abf1) 79.51%.
Report is 1 commits behind head on main.

❗ Current head df1abf1 differs from pull request most recent head a0320b1. Consider uploading reports for the commit a0320b1 to get more accurate results

Files	Patch %	Lines
logger.go	66.66%	5 Missing ⚠️
pkg.go	68.75%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   80.16%   79.51%   -0.66%     
==========================================
  Files          11       11              
  Lines         731      737       +6     
==========================================
  Hits          586      586              
- Misses        131      137       +6     
  Partials       14       14              

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