[Feature]: Genimi-1.5-Pro的添加

### Class | 类型

None

### Feature Request | 功能请求

现在有关Gemini的免费版本已经升级到了Gemini-1.5-pro，作者大大能不能添加一下使用，我查询了Google的API文档，但是没有找到Gemini-1.5-pro对应的Url请求使用的模型代号🥺

Start by locating the existing Gemini integration and its model-selection or Google API configuration entry points; the issue does not name files or tests. Check the current Google API documentation for the Gemini 1.5 Pro model identifier, then verify that the model can be selected and a request completes successfully.

Written by the indexing model from the issue text.