Add embedding function to cohere

[Barqawiz]

• 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