Add support for compressed cloud-init file log parsing

[JSCU-CNI]

This PR adds support for compressed cloud-init log parsing and fixes #904.

[codecov]

Codecov Report

Attention: Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.65%. Comparing base (9cc9de4) to head (563998a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/os/unix/log/messages.py	73.91%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #902      +/-   ##
==========================================
- Coverage   76.65%   76.65%   -0.01%     
==========================================
  Files         316      316              
  Lines       27086    27101      +15     
==========================================
+ Hits        20764    20774      +10     
- Misses       6322     6327       +5     

Flag	Coverage Δ
unittests	76.65% <73.91%> (-0.01%)	⬇️

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