[Breakdown] AppConfiguration SetKeyValue

[ahsonkhan]

• Sample building with expected design - Add samples for Get, Set, and Delete Configuration Settings with comparisons of what we'd expect the user experience to be. #6286
• Sample running
• Readme doc
• (optional) Hand-written SDK matches expected design
• Live Tests
• Recorded Tests
• Generated code matches expected design

https://github.com/Azure/azure-rest-api-specs/blob/b6bead0df961af706e984e2b9807c8a099ece61b/specification/appconfiguration/AppConfiguration/routes.tsp#L319

https://learn.microsoft.com/en-us/azure/azure-app-configuration/rest-api-key-value?pivots=v23-11#set-key

There are three potential scenarios here:
SetKeyValue, SetKeyValue (conditional), and expressing the endpoint with an AddKeyValue convenience.