Add dict and json output to dumpstruct

[Schamper]

Refactors dumpstruct to add the ability to generate dict and JSON information about a structure. The rendering is also updated to use this dictionary representation.

Also some small maintenance cleanup on the example scripts.

Disclaimer: this change has a fairly high vibe ratio, but it ends up handling quite a few dumpstruct improvements.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 112 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (9f12b1e) to head (d9cc121).

Files with missing lines	Patch %	Lines
dissect/cstruct/utils.py	0.00%	112 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #156   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         21      21           
  Lines       2482    2549   +67     
=====================================
- Misses      2482    2549   +67     

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

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[codspeed-hq]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

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_{Comparing dumpstruct-json (d9cc121) with main (9f12b1e)}