feat: cortex engine x model versioning

[louis-menlo]

Describe the bug
We need to version the engine and model somehow, so that we can ask the user to install the corresponding engine and model version. Otherwise, it breaks

They all show 0.0.1 now

Subtasks

• Engine version fix: persists engine version on init #969
• Model version
• Error handling

To Reproduce
Steps to reproduce the behavior:

1. run cortex engines list
2. See error

Expected behavior
Support pulling of engine versions

[louis-menlo]

Ps: Cortex engine x model versioning

[louis-menlo]

Done from cortex size