[FEATURE] Mistral AI supports function calling

[czelabueno]

This PR adds function calling support for MistralAI chat and streaming completions models.

Also, add and deprecate the Mistral AI models like:

• open-mistral-7b, 
• open-mixtral-8x7b, 
• mistral-small-latest, 
• mistral-medium-latest, 
• mistral-large-latest,
• mistral-tiny (deprecated)
• mistral-medium (deprecated)

Others PR related:

1. MistralAI Examples with function calling PR#68
2. MistralAI Function Calling documentation PR#765
3. Updating the integration table by adding the function calling as new column for other integrations PR#766

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Files that changed from the base of the PR and between 91db3d3 and 056a172.

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[langchain4j]

@czelabueno thank you a lot, great job as always! I have left a few minor comments/suggestions, but we could also merge it. LMK if you want to address these comments before the next release (this friday or next monday)

[czelabueno]

@langchain4j this PR has been updated with the resolution of all your comments.
About AiServicesWithToolsIT, the chatLanguageModelProvider() method has been generated, which is being used to parameterize the test by @MethodSource.
So far it has implemented OpenAI and MistralAI models. I have only updated the tests that make sense for both of us.

Additionally, I updated TestStreamingResponseHandler to support AiMessage.text() as null so that some streaming tests that use this class and support function calls don't break.

[langchain4j]

@czelabueno thank you so much, great job! And right in time for the release :)