[FR] Analyzer for observable validation

[nusantara-self]

Feature description
An analyzer to validate observables (IPs, domains, URLs, emails, etc.), ensuring structural correctness and if possible, detecting suspicious patterns like Punycode domains or obfuscated strings.

Describe the solution you'd like

• Validate data types (IP, domain, URL, email, etc.) for correctness.
• If possible, flag suspicious indicators like IDNs (Punycode), unusual characters, and suspicious patterns / unicode override characters.
• Classify observables as valid, invalid, or suspicious.