Merge branch 'standard_outputs' into cc/openai_v1
# Conflicts:
# libs/core/langchain_core/language_models/v1/chat_models.py
# libs/core/langchain_core/messages/utils.py
# libs/core/langchain_core/messages/v1.py
# libs/partners/openai/langchain_openai/chat_models/_compat.py
# libs/partners/openai/langchain_openai/chat_models/base.py
