draft: add DangerousBodyException

[bitterpanda63]

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

🚀 New Features

• Added DangerousBodyException class to represent dangerous request bodies.

⚡ Enhancements

• Enforced JWT payload byte-size limit and handled oversized payloads.
• Introduced recursion depth limit in StringExtractor and propagated exceptions.

🔧 Refactors

• Adjusted Scanner to catch AikidoException and rethrow after scanning.

^{More info}

[codecov]

Codecov Report

❌ Patch coverage is 72.41379% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ikido/agent_api/helpers/patterns/LooksLikeJWT.java	55.55%	4 Missing ⚠️
.../agent_api/helpers/extraction/StringExtractor.java	85.71%	2 Missing ⚠️
.../dev/aikido/agent_api/vulnerabilities/Scanner.java	0.00%	2 Missing ⚠️

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