feat(guardrails): add lasso security guardrails

[raskanskyz-lasso]

Add Lasso Security Integration Plugin for AI Content Classification

Description

• Implemented new Lasso Security plugin for real-time content classification and security guardrails
• Added core functionality in plugins/lasso/classify.ts for message analysis
• Created comprehensive documentation in plugins/lasso/README.md
• Added test suite in plugins/lasso/lasso.test.ts
• Integrated plugin into the main plugin registry in plugins/index.ts
• Included plugin manifest in plugins/lasso/manifest.json

Motivation

• Enhances gateway security by integrating Lasso Security's Deputies Public API

Key Features

• Real-time message classification
• Detailed classification results with confidence scores

This PR adds a complete integration with Lasso Security's Deputies API, providing gateway users with advanced security classification capabilities for their AI applications.

[VisargD]

Hi @raskanskyz-lasso, thanks for the PR! We will review it soon.

[raskanskyz-lasso]

thank you @VisargD !