feat: add multi guardrails endpoint

[abhijitjavelin]

Title

feat: add multi guardrails endpoint for Javelin guardrails. This will make sure to support any newly added guardrails in future seamlessly without raising new prs to repo.

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Type

🆕 New Feature
🧹 Refactoring
📖 Documentation
✅ Test

Changes

Multi guardrails endpoint support: Added logic to automatically apply all enabled guardrails in app policy when using javelin_guard as the guardrail name
URL routing enhancement: Modified the Javelin guardrail hook to use /guardrails/apply endpoint instead of /guardrail/{guard_name}/apply when javelin_guard is specified
Documentation update: Added example configuration for the new multi guardrails endpoint in the Javelin guardrails documentation
Comprehensive testing: Added test case test_javelin_guardrail_javelin_guard() to verify the multi guardrails functionality

Files Modified:
litellm/proxy/guardrails/guardrail_hooks/javelin/javelin.py - Core logic for multi guardrails endpoint
docs/my-website/docs/proxy/guardrails/javelin.md - Documentation with example configuration
tests/guardrails_tests/test_javelin_guardrails.py - Test coverage for new functionality

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[abhijitjavelin]

loom : https://www.loom.com/share/606c53ce328643319972d4ebb1ea675a?sid=bdeb3c64-8802-47b9-bf85-dcaca2ce182e