Callbacks Refactor [base] (#3256)

Co-authored-by: Nuno Campos <nuno@boringbits.io>
Co-authored-by: Davis Chase <130488702+dev2049@users.noreply.github.com>
Co-authored-by: Zander Chase <130414180+vowelparrot@users.noreply.github.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

langchain/__init__.py

@@ -5,11 +5,6 @@ from typing import Optional
 
 from langchain.agents import MRKLChain, ReActChain, SelfAskWithSearchChain
 from langchain.cache import BaseCache
-from langchain.callbacks import (
-    set_default_callback_manager,
-    set_handler,
-    set_tracing_callback_manager,
-)
 from langchain.chains import (
     ConversationChain,
     LLMBashChain,
@@ -67,7 +62,6 @@ del metadata  # optional, avoids polluting the results of dir(__package__)
 
 verbose: bool = False
 llm_cache: Optional[BaseCache] = None
-set_default_callback_manager()
 
 # For backwards compatibility
 SerpAPIChain = SerpAPIWrapper
@@ -119,7 +113,5 @@ __all__ = [
     "VectorDBQAWithSourcesChain",
     "QAWithSourcesChain",
     "PALChain",
-    "set_handler",
-    "set_tracing_callback_manager",
     "LlamaCpp",
 ]