Add helpers for password history

[Schamper]

Needed a few more utilities. Also started returning [] for multi-valued attributes that don't have any value, instead of None. This saves checking for or [] in a few places.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (c85667a) to head (fa372c7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/database/ese/ntds/util.py	0.00%	13 Missing ⚠️
dissect/database/ese/ntds/objects/object.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #29   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files        146     146           
  Lines       3893    3908   +15     
=====================================
- Misses      3893    3908   +15     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 6 untouched benchmarks

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_{Comparing moaaarr-ntds (fa372c7) with main (c85667a)}