update get_embedding function to account for new openai client

[bbytiger]

Because of OpenAI python client 1.0.0 upgrade, we can no longer have openai.Embedding

See similar issue here:
langchain-ai/langchain#12943

[pkavumba]

@bbytiger Thank you for the pull request. Implementing this change may pose a compatibility issue for users on the old OpenAI version 0.28 and below. To maintain backward compatibility, could we consider incorporating a version-aware implementation? Specifically, utilize this implementation for versions above 1, and stick to the old implementation for those on version 0.28 and below. If it’s not too much to ask for, we could consider relocating the old and new implementations to separate files. Subsequently, we could import the appropriate function based on the user's OpenAI version (openai.__version__), ensuring a cleaner and version-specific implementation

[pkavumba]

I will merge this PR for now, then implement the version-aware class later