Feedback for prompty spec

[LittleLittleCloud]

original source: microsoft/semantic-kernel#6033

.Inputs

SK also supports follow fields for input_variable:

• IsRequest: bool
• JsonSchema: object (a schema object similar to tool)
• AllowUnsafeContent: bool ( This flag indicates if the input variable should be treated as unsafe content or not. If it's unsafe content, sk will escape sensitive data like message tag by encoding it)

.Model && .Model.Parameter

Adding more model support like huggingface/gemini/mistral etc, plus executing setting for these model