fix: support nested config format for embedder configuration

- support nested config format with embedderconfig typeddict  
- fix parsing for model/model_name compatibility  
- add validation, typing_extensions, and improved type hints  
- enhance embedding factory with env var injection and provider support  
- add tests for openai, azure, and all embedding providers  
- misc fixes: test file rename, updated mocking patterns

src/crewai/rag/storage/base_rag_storage.py

@@ -1,6 +1,9 @@
 from abc import ABC, abstractmethod
 from typing import Any
 
+from crewai.rag.embeddings.factory import EmbedderConfig
+from crewai.rag.embeddings.types import EmbeddingOptions
+
 
 class BaseRAGStorage(ABC):
     """
@@ -13,7 +16,7 @@ class BaseRAGStorage(ABC):
         self,
         type: str,
         allow_reset: bool = True,
-        embedder_config: dict[str, Any] | None = None,
+        embedder_config: EmbeddingOptions | EmbedderConfig | None = None,
         crew: Any = None,
     ):
         self.type = type