Add vmtar tool

[Schamper]

Makes it easy to unpack visor tarfiles from the command line.

Also some project maintenance updates.

[codecov]

Codecov Report

Attention: Patch coverage is 46.55172% with 31 lines in your changes missing coverage. Please review.

Project coverage is 65.94%. Comparing base (317023b) to head (5f02615).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/hypervisor/util/vmtar.py	42.30%	30 Missing ⚠️
dissect/hypervisor/tools/vmtar.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   66.51%   65.94%   -0.58%     
==========================================
  Files          23       24       +1     
  Lines        2025     2079      +54     
==========================================
+ Hits         1347     1371      +24     
- Misses        678      708      +30     

Flag	Coverage Δ
unittests	65.94% <46.55%> (-0.58%)	⬇️

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