Feat: Custom plugin streaming

[lena-larionova]

Description

Docs for custom plugin streaming on DCGWs.

Testing instructions

Preview link: https://deploy-preview-8556--kongdocs.netlify.app/konnect/gateway-manager/dedicated-cloud-gateways/custom-plugins/

Checklist

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

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[lena-larionova]

@cloudjumpercat I added just one line about the UI: https://github.com/Kong/docs.konghq.com/pull/8556/files#diff-c95c75b11ab7a5175cccb8198f5c1768c276af88e0609783e97bbf9c7751ac60R28

Hopefully that'll get ahead of any concerns.