Add middlewares for cozy filtering and logging

[EvgenyOvsov]

Hi.
For my cases, I need to filter requests or analyze it in any way, so I decided to add middleware in your socks server

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 66.66%. Comparing base (8de715f) to head (ebe069a).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
handle.go	64.28%	5 Missing ⚠️
option.go	68.75%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   63.13%   66.66%   +3.52%     
==========================================
  Files          14       14              
  Lines         784      726      -58     
==========================================
- Hits          495      484      -11     
+ Misses        230      184      -46     
+ Partials       59       58       -1     

Flag	Coverage Δ
unittests	66.66% <66.66%> (+3.52%)	⬆️

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[thinkgos]

Hi, if i set custom user's handle, the middlewares no effect, Can you modify this!

[EvgenyOvsov]

Yeah, sorry, my fault. Fixed