Fix Gemini Tool Calling for texts returned from MethodToolCallback #3040
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MethodToolCallbackcan return aString(which is Textual Json/Json String) that is not supported byjsonToStructmethod. => UpdatejsonToStructmethod with Textual Json/Json String.MethodToolCallbackrelies onDefaultToolCallResultConverterwhich is not always return Textual Json/Json String, in case of methodReturnType isvoid, it simply returns simpleString: "Done" that cannot be parsed byjsonToStruct=> UpdateDefaultToolCallResultConverteralways return Textual Json/Json String.