Standardizing provider specific errors, mainly for rate limit and timeout errors

[ai-learner-00]

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Feature request

Are there any plans to standardize provider specific errors such as openai.RateLimitError and LengthFinishReasonError?

Motivation

Currently we would have to figure out the error returned by each provider, which takes time and potentially requires trying to reproduce them.

Proposal (If applicable)

A class that looks like langchain.RateLimitError(original_error, num_retries, time of each retries or other info...) emitted by the LLM objects and potentially a way to pass an object RetryConfig(max_retries, jitter, exponential_backoff, max_retry_delay, ... to customize the retry logic.