Support Mistral format tools

[AlongWY]

What does this PR do?

Support Mistral format tools

<s>[AVAILABLE_TOOLS] [{"type": "function", "function": {"name": "get_news", "description": "获取最新新闻文章", "parameters": {"type": "object", "properties": {"category": {"type": "string", "description": "要检索的新闻文章类别"}, "country": {"type": "string", "description": "获取新闻文章的国家"}}, "required": ["category"]}}}, {"type": "function", "function": {"name": "search_books", "description": "根据提供的标准搜索书籍", "parameters": {"type": "object", "properties": {"title": {"type": "string", "description": "这本书的标题"}, "author": {"type": "string", "description": "这本书的作者"}, "genre": {"type": "string", "description": "这本书的类型"}}}}}][/AVAILABLE_TOOLS][INST] 你能帮我找到最新的美国体育新闻吗？[/INST][TOOL_CALLS] [{"name": "get_news", "arguments": {"category": "运动", "country": "美国"}}][TOOL_RESULTS] {"content": {"title": "NBA总决赛：湖人队对阵热火队", "link": "NBA官方网站"}}[/TOOL_RESULTS][TOOL_RESULTS] {"content": {"title": "NFL：爱国者队击败酋长队", "link": "https://www.nfl.com/新闻"}}[/TOOL_RESULTS][TOOL_RESULTS] {"content": {"title": "MLB：道奇队赢得世界系列赛", "link": "https://www.mlb.com/新闻"}}[/TOOL_RESULTS] 1. NBA总决赛：湖人队对阵热火队
2. NFL：爱国者队击败酋长队
3. MLB：道奇队赢得世界系列赛

Before submitting

• Did you read the contributor guideline?
• Did you write any new necessary tests?

[AlongWY]

@hiyouga 你能看看这个分支吗？这里主要是为了支持 mistral 格式的 parallel function call