Add embedding function to cohere

- Update the config to include the embedding link.
- Add embedding function to cohere wrapper.
- Create embedding input class / or add to the class if created.
- Create remote embedding class / or update if exist.
- Create unit testing class.

Embedding api: "/v1/embed"

Code example from the node connector:
https://github.com/Barqawiz/IntelliNode/blob/main/IntelliNode/wrappers/CohereAIWrapper.js