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

tests/utilities/test_azure_embedder_config.py

@@ -0,0 +1,82 @@
+"""Test Azure embedder configuration with nested format only."""
+
+from unittest.mock import MagicMock, patch
+
+from crewai.rag.embeddings.configurator import EmbeddingConfigurator
+
+
+class TestAzureEmbedderConfiguration:
+    """Test Azure embedder configuration with nested format."""
+
+    @patch(
+        "chromadb.utils.embedding_functions.openai_embedding_function.OpenAIEmbeddingFunction"
+    )
+    def test_azure_openai_with_nested_config(self, mock_openai_func):
+        """Test Azure configuration using OpenAI provider with nested config key."""
+        mock_embedding = MagicMock()
+        mock_openai_func.return_value = mock_embedding
+
+        configurator = EmbeddingConfigurator()
+
+        embedder_config = {
+            "provider": "openai",
+            "config": {
+                "api_key": "test-azure-key",
+                "api_base": "https://test.openai.azure.com/",
+                "api_type": "azure",
+                "api_version": "2023-05-15",
+                "model": "text-embedding-3-small",
+                "deployment_id": "test-deployment",
+            },
+        }
+
+        result = configurator.configure_embedder(embedder_config)
+
+        mock_openai_func.assert_called_once_with(
+            api_key="test-azure-key",
+            model_name="text-embedding-3-small",
+            api_base="https://test.openai.azure.com/",
+            api_type="azure",
+            api_version="2023-05-15",
+            default_headers=None,
+            dimensions=None,
+            deployment_id="test-deployment",
+            organization_id=None,
+        )
+        assert result == mock_embedding
+
+    @patch(
+        "chromadb.utils.embedding_functions.openai_embedding_function.OpenAIEmbeddingFunction"
+    )
+    def test_azure_provider_with_nested_config(self, mock_openai_func):
+        """Test using 'azure' as provider with nested config."""
+        mock_embedding = MagicMock()
+        mock_openai_func.return_value = mock_embedding
+
+        configurator = EmbeddingConfigurator()
+
+        embedder_config = {
+            "provider": "azure",
+            "config": {
+                "api_key": "test-azure-key",
+                "api_base": "https://test.openai.azure.com/",
+                "api_version": "2023-05-15",
+                "model": "text-embedding-3-small",
+                "deployment_id": "test-deployment",
+            },
+        }
+
+        result = configurator.configure_embedder(embedder_config)
+
+        mock_openai_func.assert_called_once_with(
+            api_key="test-azure-key",
+            api_base="https://test.openai.azure.com/",
+            api_type="azure",
+            api_version="2023-05-15",
+            model_name="text-embedding-3-small",
+            default_headers=None,
+            dimensions=None,
+            deployment_id="test-deployment",
+            organization_id=None,
+        )
+        assert result == mock_embedding