More flexible error handling

[alex-treebeard]

Is your feature request related to a problem? Please describe. An issue stated that marking expected errors in metadata could be less cumbersome Describe the solution you'd like Potentially a python api for catching certain error types (similar to nbclient) Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context https://github.com/langchain-ai/langchain/issues/94