Publish schemas for other Zed configuration files

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Check for existing issues

• Completed

Describe the feature

There is a schema for the themes JSON file, but no schemas for the extension.toml/extension.json file or the config.toml file for languages. Would be appreciated if there were at least schemas for these to supplement the docs and for improved editor experience.

Environment

N/A

If applicable, add mockups / screenshots to help present your vision of the feature

No response