Addition of Azure as a supported model provider

[ayaviri]

What

Title. Now an Azure client that just uses OpenAI's service or one that points to a resource hosted on Azure can be instantiated with createLLMClient

More specifically

• Creation of a BaseProvider class that provides a template for the addition of new providers. In order to achieve this, each Provider class is now composed with a instance of its client as opposed to being an instance since Typescript does nto support multiple inheritance. Now, the addition of a new provider only requires:
  1. Defining a new "extended" provider input parameter type (eg. Anthropic offers the "claude" series of models as opposed to the "gpt" series)
  2. Implementing the transformation from this extended input parameter type to the provider's input parameter type
  3. Implementing the transformations from the provider's API response to the extended output parameter type (eg. the original response is typically included as a field), both for streaming and non-streaming endpoints
• Refactor of Anthropic client wrapper to use this BaseProvider class
• Addition of Azure client wrapper
• Client authentication was slightly changed in the createLLMClient method in order to accommodate for the myriad of ways Azure's client can be authenticated. See updated README for more. This seems a bit hacky, so I'm looking definitely looking for concrete suggestions on this

Testing

The existing test suite was reused for Azure's OpenAI models

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