Add libvirt loader and qemu child plugin

[Miauwkeru]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.48%. Comparing base (22d1ca8) to head (fc45ee0).

Files	Patch %	Lines
dissect/target/loaders/libvirt.py	96.42%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #654      +/-   ##
==========================================
+ Coverage   75.45%   75.48%   +0.03%     
==========================================
  Files         296      298       +2     
  Lines       25643    25684      +41     
==========================================
+ Hits        19348    19388      +40     
- Misses       6295     6296       +1     

Flag	Coverage Δ
unittests	75.48% <97.56%> (+0.03%)	:arrow_up:

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