Add loader for Netscaler techsupport collector files

[lhaagsma]

Adds loader for NetScaler 'techsupport' Collector files. These are tar files so a TarSubLoader was created. Added test data thanks to @yunzheng.

Closes: https://github.com/fox-it/dissect.target/issues/1291

[codecov[bot]]

Codecov Report

:x: Patch coverage is 91.83673% with 4 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 80.76%. Comparing base (580341b) to head (dc9b827). :warning: Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...issect/target/plugins/os/unix/bsd/citrix/locale.py	84.61%	2 Missing :warning:
dissect/target/loaders/nscollector.py	93.75%	1 Missing :warning:
dissect/target/plugins/os/unix/bsd/_os.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1373      +/-   ##
==========================================
+ Coverage   80.74%   80.76%   +0.02%     
==========================================
  Files         390      391       +1     
  Lines       34217    34241      +24     
==========================================
+ Hits        27629    27656      +27     
+ Misses       6588     6585       -3     

Flag	Coverage Δ
unittests	80.76% <91.83%> (+0.02%)	:arrow_up:

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #1373 will not alter performance

_{Comparing lhaagsma:netscaler-collector (dc9b827) with main (580341b)}

Summary

✅ 9 untouched