fix: add nipunaperera.vscode-kafka-client

[nipunap]

• I have read the note above about PRs contributing or fixing extensions
• I have tried reaching out to the extension maintainers about publishing this extension to Open VSX (if not, please create an issue in the extension's repo using this template).
• This extension has an OSI-approved OSS license (we don't accept proprietary extensions in this repository)

Description

Adding nipunaperera.vscode-kafka-client extention to auto publish extentions list

[nipunaudemy]

seems we don't need this, I have setup CI/CD with github actions using token to auto publish