feat: update Cohere embedding model to use langchain_cohere, added support to dynamically load latest embedding models, improved error handling

[edwinjosechittilappilly]

This pull request includes several changes to the CohereEmbeddingsComponent class in the src/backend/base/langflow/components/embeddings/cohere.py file, as well as a minor update to the pyproject.toml file. The changes focus on improving the functionality and robustness of the CohereEmbeddingsComponent class.

Improvements to CohereEmbeddingsComponent class:

• Added import statements for Any from typing and cohere library.
• Updated SecretStrInput and DropdownInput fields to include real-time refresh, refresh button, and combobox options. [1] [2]
• Enhanced the build_embeddings method to include error handling and status updates.
• Introduced the get_model method to fetch available models from the Cohere API.
• Added update_build_config method to dynamically update the build configuration based on field values.

Minor update to pyproject.toml:

• Fixed a trailing comma in the dependencies list.

closes: #5943

[edwinjosechittilappilly]

@ogabrielluiz can we merge it!