Introduced 'azureml' LangChain language model provider

[codingbandit]

Introduced 'azureml' LangChain language model provider

Details on the issue fix or feature implementation

Supports AzureML LLM model endpoints that adhere to the OpenAI schema (ex. Llama-2, Phi3, Mistral, etc.)

Also updated LangChain imports to the latest version, as well as tiktoken and openai packages.

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• [ ] I have included unit tests for the issue/feature
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• [ ] I have updated relevant docs, where applicable