[PY] genkit-plugin-ollama missing objects ModelDefinition, EmbeddingModelDefinition

[axisrow]

Describe the bug
Installing genkit-plugin-ollama (version 0.4.0) as instructed by the official documentation leads to ImportError when attempting to use EmbeddingModelDefinition or ModelDefinition from the plugin.

To Reproduce
Steps to reproduce the behavior:

1. Follow the official instructions from [Genkit documentation](https://genkit.dev/docs/integrations/ollama/?lang=python).
2. Install genkit-plugin-ollama using pip3 install genkit-plugin-ollama.
3. Attempt to import EmbeddingModelDefinition or ModelDefinition from genkit.plugins.ollama in a Python script.

Code samples:

from genkit.plugins.ollama import EmbeddingModelDefinition, ModelDefinition

Error message:

ImportError: cannot import name 'EmbeddingModelDefinition' (or 'ModelDefinition') from 'genkit.plugins.ollama'
(/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/genkit/plugins/ollama/__init__.py)

Expected behavior
EmbeddingModelDefinition and ModelDefinition should be importable from genkit.plugins.ollama as indicated by the official documentation.

Runtime (please complete the following information):

• OS: MacOS
• Genkit Version: genkit-plugin-ollama==0.4.0

Python version

• python3 --version: Python 3.11.9

Additional context
The instructions were taken directly from the official Genkit documentation: https://genkit.dev/docs/integrations/ollama/?lang=python.
However, the imports for EmbeddingModelDefinition and ModelDefinition fail, preventing proper configuration of Ollama models within Genkit.

[axisrow]

So?