fix: Update embedding configuration and fix type errors

- Add configurable embedding providers (OpenAI, Ollama)
- Fix type hints in base_tool and structured_tool
- Add proper json property implementations
- Update documentation for memory configuration
- Add environment variables for embedding configuration
- Fix type errors in task and crew output classes

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/conftest.py

@@ -1,4 +1,30 @@
 # conftest.py
+import os
+import pytest
 from dotenv import load_dotenv
 
 load_result = load_dotenv(override=True)
+
+@pytest.fixture(autouse=True)
+def setup_test_env():
+    """Configure test environment to use Ollama as the default embedding provider."""
+    # Store original environment variables
+    original_env = {
+        "CREWAI_EMBEDDING_PROVIDER": os.environ.get("CREWAI_EMBEDDING_PROVIDER"),
+        "CREWAI_EMBEDDING_MODEL": os.environ.get("CREWAI_EMBEDDING_MODEL"),
+        "CREWAI_OLLAMA_URL": os.environ.get("CREWAI_OLLAMA_URL"),
+    }
+    
+    # Set test environment
+    os.environ["CREWAI_EMBEDDING_PROVIDER"] = "ollama"
+    os.environ["CREWAI_EMBEDDING_MODEL"] = "llama2"
+    os.environ["CREWAI_OLLAMA_URL"] = "http://localhost:11434/api/embeddings"
+    
+    yield
+    
+    # Restore original environment
+    for key, value in original_env.items():
+        if value is None:
+            os.environ.pop(key, None)
+        else:
+            os.environ[key] = value