[FEATURE] Mistral in Azure Chat Model Family

[mvenkatsriram]

Describe the feature you'd like Currently "Mistral Large" LLM is available only in "ChatMistralAI" Along with GPT 3.5 Turbo, GPT 4. Kindly add Mistral Large as well in "Azure ChatOpenAI"

or provide facility to change the endpoint url in "ChatMistralAI", so that we can use it both in Azure hosted and Mistral Hosted versions.