[Example]: C++ example for RestoreObject

Background story

RestoreObject example is missing in c++ demos. Could you plz add a demo for it?

What does this example accomplish?

restore an object in GLACIER

Which AWS service(s)?

S3

Which AWS SDKs or tools?

• All languages
• .NET
• C++
• Go (v2)
• Java
• Java (v2)
• JavaScript
• JavaScript (v3)
• Kotlin
• PHP
• Python
• Ruby
• Rust
• Swift
• Not applicable

Are there existing code examples to leverage?

No response

Do you have any reference code?