Add new Question function to existing ClassificationSkill samples

[sw47]

Motivation and Context

1. Why is this change required?

Today, there is no sample skill that tells whether a given sentence is a question or statement.

2. What problem does it solve?

SK can now use the new skill to classify if a sentence is a question

Description

Add new Question function to existing ClassificationSkill samples

Contribution Checklist

• [x] The code builds clean without any errors or warnings
• [x] The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• [x] The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• [x] All unit tests pass, and I have added new tests where possible
• [x] I didn't break anyone :smile: