Add a schema to extensions, to prevent installing extensions on too old of a Zed version (#9599)

Release Notes:

- N/A

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Co-authored-by: Marshall <marshall@zed.dev>
585e8671e3Max Brunsfeld committed on 3/20/2024, 9:33:26 PM· committed by GitHubparentb1feeb9
22 files changedLine totals unavailable