Add functional options for MGClient

[kifril-ltd]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (4058284) 55.22% compared to head (ab53594) 54.06%.

❗ Current head ab53594 differs from pull request most recent head be58736. Consider uploading reports for the commit be58736 to get more accurate results

Files	Patch %	Lines
v1/client.go	27.27%	7 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   55.22%   54.06%   -1.16%     
==========================================
  Files           3        3              
  Lines         335      344       +9     
==========================================
+ Hits          185      186       +1     
- Misses         85       92       +7     
- Partials       65       66       +1     

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