Azure OpenAI Rate Limits

[jasonacox]

Add some code to chatbot to help with rate limits:

INFO:server:ERROR: Error code: 429 - {'error': {'message': "litellm.RateLimitError: AzureException RateLimitError - Error code: 429 - {'error': {'code': '429', 'message': 'Requests to the ChatCompletions_Create Operation under Azure OpenAI API version 2023-05-15 have exceeded token rate limit of your current AIServices S0 pricing tier. Please retry after 86400 seconds. Please contact Azure support service if you would like to further increase the default rate limit.'}}\nReceived Model Group=azure-gpt-4o-mini\nAvailable Model Group Fallbacks=None", 'type': 'throttling_error', 'param': None, 'code': '429'}}