Removing LangChain and Rebuilding Executor (#1322)

* rebuilding executor

* removing langchain

* Making all tests good

* fixing types and adding ability for nor using system prompts

* improving types

* pleasing the types gods

* pleasing the types gods

* fixing parser, tools and executor

* making sure all tests pass

* final pass

* fixing type

* Updating Docs

* preparing to cut new version

tests/pipeline/test_pipeline.py

@@ -616,7 +616,6 @@ def test_pipeline_invalid_crew(mock_crew_factory):
         Pipeline(stages=[crew1, not_a_crew])
 
     error_msg = str(exc_info.value)
-    print(f"Full error message: {error_msg}")  # For debugging
     assert (
         "Expected Crew instance, Router instance, or list of Crews, got <class 'str'>"
         in error_msg