Retry ServiceUnavailableError

[yuta0x89]

Background

This is the PR for retrying when a ServiceUnavailableError occurs.
This is an improved version of #4744 .

Changes

The code has been modified to perform a retry operation when a ServiceUnavailableError (503 error) occurs.

The original code handles specific exceptions such as APIError and Timeout that occur when calling the OpenAI API. When one of the two exceptions occurs, Auto-GPT checks if the HTTP status code of that exception is 429, 502, 503, or if the default number of retry attempts (num_attempts) has been reached. If so, it rethrows (raises) the exception.

However, when specific exceptions such as APIError and Timeout occur, the HTTP status code can not become 503. The HTTP status code becomes 503 only when a ServiceUnavailableError occurs. Therefore, I added the process to handle the occurrence of ServiceUnavailableError.

Documentation

Test Plan

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring autogpt tests --in-place

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.09 🎉

Comparison is base (9e99db1) 70.77% compared to head (3440994) 70.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4789      +/-   ##
==========================================
+ Coverage   70.77%   70.87%   +0.09%     
==========================================
  Files          68       68              
  Lines        3326     3327       +1     
  Branches      532      532              
==========================================
+ Hits         2354     2358       +4     
+ Misses        795      793       -2     
+ Partials      177      176       -1     

Impacted Files	Coverage Δ
autogpt/llm/providers/openai.py	90.82% <100.00%> (+0.08%)	⬆️

... and 1 file with indirect coverage changes

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