feat: Add FAISS search tool

- Implement FAISSSearchTool for vector similarity search
- Add comprehensive unit tests
- Update documentation with usage examples
- Add FAISS dependency

Closes #2118

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

pyproject.toml

@@ -37,6 +37,7 @@ dependencies = [
     "tomli>=2.0.2",
     "blinker>=1.9.0",
     "json5>=0.10.0",
+    "faiss-cpu>=1.7.4",
 ]
 
 [project.urls]