Init_embeddings does not support `google_gemini`

Supported providers and their required packages:

  • azure_openai: langchain-openai
  • bedrock: langchain-aws
  • cohere: langchain-cohere
  • google_vertexai: langchain-google-vertexai
  • huggingface: langchain-huggingface
  • mistralai: langchain-mistralai
  • ollama: langchain-ollama
  • openai: langchain-openai

This makes it harder to run the apis without google gcp account.