feat: complete monorepo transformation with tools integration

- Add crewai-tools as git subtree preserving full history
- Move tools to proper src/ directory structure with git mv
- Configure tools pyproject.toml for workspace dependency on crewai-core
- Update workspace configuration to include both packages
- Fix build configurations for both packages

packages/tools/src/crewai_tools/rag/__init__.py

@@ -0,0 +1,8 @@
+from crewai_tools.rag.core import RAG, EmbeddingService
+from crewai_tools.rag.data_types import DataType
+
+__all__ = [
+    "RAG",
+    "EmbeddingService",
+    "DataType",
+]