List model versions

Example cURL request: ```console curl -s \ -H "Authorization: Bearer $REPLICATE_API_TOKEN" \ https://api.replicate.com/v1/models/replicate/hello-world/versions ``` The response will be a JSON array of model version objects, sorted with the most recent version first: ```json { "next": null, "previous": null, "results": [ { "id": "5c7d5dc6dd8bf75c1acaa8565735e7986bc5b66206b55cca93cb72c9bf15ccaa", "created_at": "2022-04-26T19:29:04.418669Z", "cog_version": "0.3.0", "openapi_schema": {...} } ] } ```