yalei

enhancement of Azure service

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1. move the `create_context_aggregator` method to `BaseOpenAILLMService`, so that `AzureLLMService` also has this method 2. auto detect multi-language and play speed in Azure STT

can not list conversations via the service api

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### Self Checks - [X] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [X] I have searched for existing...