Support official models

[andreasjansson]

Official models don't have a list of versions

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Important

Add support for official models without version lists by handling ReplicateError and using latest_version.

• Behavior:
  • Handle ReplicateError with status 404 in cog_safe_push/main.py, cog_safe_push/predict.py, and cog_safe_push/schema.py to support official models without version lists.
  • Assume models are official if 404 error occurs when accessing versions.list() and use latest_version instead.
• Functions:
  • Modify cog_safe_push() in main.py to check for official models when asserting version IDs.
  • Update predict() in predict.py to handle official models by checking ReplicateError and using model directly.
  • Add get_openapi_schema() in schema.py to fetch schema using latest_version for official models.
• Misc:
  • Import ReplicateError in predict.py and schema.py.

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