Create a typed database parser for JA4 fingerprints using macros, similar to the existing p0f database

[biandratti]

Requirements

• Parse ja4_fingerprint field
• Parse ja4_fingerprint_string field
• Parse device field
• Parse other necessary JA4-related fields
• Implement macro-based parsing (similar to p0f)
• Type-safe database structures
• Comprehensive test coverage (>90%)

Database Schema

struct Ja4DatabaseEntry {
    ja4_fingerprint: String,
    ja4_fingerprint_string: String,
    device: String,
    // Other necessary fields
}

Implementation Details

• Use existing p0f parser pattern as reference
• Focus on open-source JA4 components only (FoxIO-LLC proprietary parts excluded)
• CSV/JSON database format support
• Memory-efficient loading and querying

Acceptance Criteria

• Database loads successfully
• All fields parsed correctly
• Unit tests with >90% coverage
• Integration tests with sample data
• Documentation with examples