Refactor Analyzers: Unify Range Logic & Optimize Allocations

[oittaa]

• Centralized integer range solving logic in util.go eliminating logic duplication.
• Optimization & Pooling: Implemented sync.Pool for RangeAnalyzer, BaseAnalyzerState, and analyzer-specific caches.
• Zero-Alloc Extraction: Replaced expensive regexp and string-based type inspection with direct go/types lookup (GetIntTypeInfo).
• Covered more cases especially in G407 (hardcoded IV/nonce).

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 84.69251% with 229 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.20%. Comparing base (1216c9b) to head (4f4401e).
⚠️ Report is 161 commits behind head on master.

Files with missing lines	Patch %	Lines
analyzers/range_analyzer.go	85.25%	82 Missing and 29 partials ⚠️
analyzers/util.go	81.64%	36 Missing and 13 partials ⚠️
analyzers/hardcoded_nonce.go	87.85%	22 Missing and 12 partials ⚠️
analyzers/slice_bounds.go	78.22%	21 Missing and 6 partials ⚠️
analyzers/conversion_overflow.go	88.88%	4 Missing and 4 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1464      +/-   ##
==========================================
+ Coverage   68.49%   69.20%   +0.70%     
==========================================
  Files          75       80       +5     
  Lines        4384     6098    +1714     
==========================================
+ Hits         3003     4220    +1217     
- Misses       1233     1675     +442     
- Partials      148      203      +55     

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[ccojocar]

Are these PRs AI generated? Please could you send small PRs next time, which are only focused on one thing. This make the reviewing easier. Thanks