[SNOW-990111] Add Mono.Unix library

[sfc-gh-knozderko]

Description

Add Mono.Unix library

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fa09941) 83.75% compared to head (288b9b3) 83.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
- Coverage   83.75%   83.72%   -0.04%     
==========================================
  Files          89       89              
  Lines        9344     9344              
  Branches      861      861              
==========================================
- Hits         7826     7823       -3     
- Misses       1295     1298       +3     
  Partials      223      223              

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