Add compression-level option

[onionhammer]

Closes #146

[codecov]

Codecov Report

Attention: Patch coverage is 18.75000% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 24.62%. Comparing base (cd6542b) to head (45332b9).

Files	Patch %	Lines
src/dotnet-serve/Startup.cs	0.00%	12 Missing ⚠️
src/dotnet-serve/Program.cs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   26.84%   24.62%   -2.22%     
==========================================
  Files          17       17              
  Lines         652      666      +14     
  Branches        0      133     +133     
==========================================
- Hits          175      164      -11     
- Misses        477      487      +10     
- Partials        0       15      +15     

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