feat: AI Proxy streaming

[cloudjumpercat]

Description

Adds documentation for the new streaming mode for the AI proxy plugin for 3.7.

DOCU-3768

Testing instructions

Preview link: https://deploy-preview-7293--kongdocs.netlify.app/hub/kong-inc/ai-proxy/how-to/streaming/

Checklist

• [ ] Review label added
• [ ] Conditional version tags added, if applicable.

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[cloudjumpercat]

Hi @ttyS0e ! I left some questions for you on this PR, if you wouldn't mind checking them out when you have the time. I'll be out on PTO all next week, so I'll respond to any comments/get to revisions when I'm back on the 13th. Thanks!

[tysoekong]

I added quite a lot here. Including “how to use with an SDK” which was requested by many users and customers.

This is ready to go, from my tech standpoint.

[cloudjumpercat]

@tysoekong Thanks for adding those pages! I made some copyedits and left a few more questions on the PR for you.