refactor: use spec model for annotation extraction

[lukasmetzner]

WIP

[codecov]

Codecov Report

❌ Patch coverage is 83.82643% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.31%. Comparing base (dbe5e21) to head (3e61fad).

Files with missing lines	Patch %	Lines
internal/lbspec/opts.go	62.80%	45 Missing ⚠️
internal/hcops/load_balancer.go	80.18%	13 Missing and 8 partials ⚠️
tools/doc_generation.go	0.00%	11 Missing ⚠️
hcloud/load_balancers.go	90.69%	3 Missing and 1 partial ⚠️
internal/hcops/mocks.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1322      +/-   ##
==========================================
- Coverage   71.27%   69.31%   -1.97%     
==========================================
  Files          29       31       +2     
  Lines        2876     2643     -233     
==========================================
- Hits         2050     1832     -218     
- Misses        635      647      +12     
+ Partials      191      164      -27     

Flag	Coverage Δ
e2e	46.13% <61.29%> (+1.38%)	⬆️
unit	64.88% <78.89%> (-2.85%)	⬇️

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