Separated llms from the main llm.py file and fixed some deprication bugs

examples/lightrag_ollama_demo.py

@@ -3,7 +3,7 @@ import os
 import inspect
 import logging
 from lightrag import LightRAG, QueryParam
-from lightrag.llm import ollama_model_complete, ollama_embedding
+from lightrag.llm.ollama import ollama_model_complete, ollama_embed
 from lightrag.utils import EmbeddingFunc
 
 WORKING_DIR = "./dickens"
@@ -23,7 +23,7 @@ rag = LightRAG(
     embedding_func=EmbeddingFunc(
         embedding_dim=768,
         max_token_size=8192,
-        func=lambda texts: ollama_embedding(
+        func=lambda texts: ollama_embed(
             texts, embed_model="nomic-embed-text", host="http://localhost:11434"
         ),
     ),