feat(plugins): add Zscaler AI Guard plugin

[z-anvesha]

This commit introduces a new guardrail plugin for Zscaler AI Guard. This plugin allows the Portkey Gateway to perform security checks on prompts and LLM responses using Zscaler's Detections Policy.

Key changes include:

A new plugin handler in plugins/zscaler/main-function.ts that calls the Zscaler execute-policy API.
The handler supports both beforeRequestHook and afterRequestHook to scan inbound prompts and outbound responses.
It checks for BLOCK actions from the Zscaler API and individual detectors, returning a failed verdict if content is blocked.
Integration tests have been added in plugins/zscaler/test-file.test.ts to verify the plugin's functionality against the real Zscaler API for both safe and malicious prompts.
The plugin is defined in plugins/zscaler/manifest.json and registered in the main plugin index.
This new plugin enhances the gateway's security capabilities by integrating with Zscaler's advanced threat and data protection.

[Copilot]

Pull request overview

This PR adds a new Zscaler AI Guard plugin to the Portkey Gateway, enabling security checks on prompts and LLM responses using Zscaler's Detections Policy API. The plugin acts as a guardrail that can intercept both inbound (prompts) and outbound (responses) content, blocking requests when Zscaler's policy detects threats like prompt injections or data leakage.

Changes:

• New Zscaler AI Guard plugin with support for both beforeRequestHook and afterRequestHook execution
• Enhanced build system to handle hyphenated plugin IDs and function names
• Integration tests for the plugin (safe and malicious prompt scenarios)

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
plugins/zscaler/main-function.ts	Core plugin handler that calls Zscaler's execute-policy API, processes BLOCK/ALLOW actions, and handles errors
plugins/zscaler/manifest.json	Plugin manifest defining credentials (API key), parameters (policy ID), and supported hooks
plugins/zscaler/test-file.test.ts	Integration tests verifying plugin behavior with real Zscaler API for safe and malicious prompts
plugins/build.ts	Updated build script to support hyphenated plugin IDs by sanitizing identifiers
conf.json	Registered the new zscaler plugin in the enabled plugins list

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