[Feature] Add obfuscated URL detection to url_suspect plugin

[Feature] Add obfuscated URL detection to url_suspect plugin

Detect URLs hidden in message text using various obfuscation techniques:
- Spaced protocols (h t t p s : / /)
- hxxp variants (hxxp://)
- Bracket dots (example[.]com)
- Word dots (example dot com)
- HTML entities (. for dots)

Features:
- Hyperscan-based prefiltering for performance
- Normalization and URL extraction from obfuscated text
- URL injection with 'obscured' flag for further analysis
- Configurable via built-in settings or external maps
- DoS protection with strict limits

New symbol: URL_OBFUSCATED_TEXT (score: 5.0)