Improve VMDK

[Schamper]

Closes #58

Based on #72 for convenience.

TODO:

• Fix up COWD implementation (need to regenerate test data)
• Add more test data (e.g. snapshots), perhaps generated on ESXi
• Add benchmarks and compare to previous implementation

This implementation aims to be a little simpler than the previous one, but we should be wary for performance degradation.

[codecov]

Codecov Report

❌ Patch coverage is 86.85897% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.93%. Comparing base (ae08df8) to head (35912c8).

Files with missing lines	Patch %	Lines
dissect/hypervisor/disk/vmdk.py	86.73%	41 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   80.65%   83.93%   +3.28%     
==========================================
  Files          26       26              
  Lines        2367     2347      -20     
==========================================
+ Hits         1909     1970      +61     
+ Misses        458      377      -81     

Flag	Coverage Δ
unittests	83.93% <86.85%> (+3.28%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Miauwkeru]

I haven't looked at benchmarking it yet, but this is what I found when testing the implementation

[Schamper]

Fixed the issues and added COWD support. Still need to create some ESXi test data, ideally by expanding generate.sh. Also benchmarks.