Controlling select_speaker using Graph Modelling Language (#720)

* Completed notebook on using GML

* Added optional dependencies for graph

* Run pre-commit

* Added pytest

* Added LLM to pick an agent before catch-all

* Updated website links to notebook

* Reviewer's suggestions

* pre-commit checked

* pre-commit passed

* Change beta version

setup.py

@@ -52,6 +52,7 @@ setuptools.setup(
         "retrievechat": ["chromadb", "sentence_transformers", "pypdf", "ipython"],
         "teachable": ["chromadb"],
         "lmm": ["replicate", "pillow"],
+        "graphs": ["networkx~=3.2.1", "matplotlib~=3.8.1"],
     },
     classifiers=[
         "Programming Language :: Python :: 3",