Map all registry value types to a standardized enum in regutil

[cecinestpasunepipe]

(DIS-2090)

[Schamper]

Please use existing Python concepts for caching/lazy execution. I've given an example using @cached_property, but any other common method would also suffice.

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.70%. Comparing base (430d14c) to head (e90067d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/helpers/regutil.py	97.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
+ Coverage   76.68%   76.70%   +0.01%     
==========================================
  Files         315      315              
  Lines       27017    27033      +16     
==========================================
+ Hits        20719    20735      +16     
  Misses       6298     6298              

Flag	Coverage Δ
unittests	76.70% <97.29%> (+0.01%)	⬆️

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