Enhancement: Add JSON sanitization and parsing methods to HTTP agentflow.
- Introduced `sanitizeJsonString` to clean problematic escape sequences and fix common JSON formatting issues.
- Added `parseJsonBody` to attempt parsing JSON directly, with fallback to sanitization if parsing fails, providing clearer error messages for invalid JSON.
- Updated request handling to utilize the new parsing method for JSON and x-www-form-urlencoded body types.
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