Add Proxmox support

[Schamper]

#745 moved into our scope for uploading LFS files.

Closes #805.

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 42 lines in your changes missing coverage. Please review.

Project coverage is 76.84%. Comparing base (c97cf63) to head (bc6593b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/loaders/proxmox.py	29.26%	29 Missing ⚠️
...target/plugins/os/unix/linux/debian/proxmox/_os.py	89.04%	8 Missing ⚠️
dissect/target/plugins/child/proxmox.py	83.33%	2 Missing ⚠️
dissect/target/plugins/os/unix/_os.py	66.66%	2 Missing ⚠️
.../target/plugins/os/unix/linux/debian/proxmox/vm.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #837      +/-   ##
==========================================
- Coverage   76.87%   76.84%   -0.03%     
==========================================
  Files         318      322       +4     
  Lines       27258    27405     +147     
==========================================
+ Hits        20955    21060     +105     
- Misses       6303     6345      +42     

Flag	Coverage Δ
unittests	76.84% <72.72%> (-0.03%)	⬇️

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.