[Breakdown] AppConfiguration List Snapshot KeyValues

[ahsonkhan]

• Sample building with expected design
• Sample running
• Readme doc
• (optional) Hand-written SDK matches expected design
• Live Tests
• Recorded Tests
• Generated code matches expected design

Note: TSP route is missing and hence no C++ SDK method is generated

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

[ahsonkhan]

Other languages implemented this as a convenience method top of GetConfigurationSettings, with a required snapshot name parameter (maybe they couldn't or didn't want to extend the existing API accepting a SettingSelector for the newly added snapshot feature):
GetConfigurationSettingsForSnapshot

At initial glance, we don't have to go down that route in C++ and enable the scenario through the existing GetConfigurationSettings which accepts an Options bag that contains Snapshot. This follows the spec more closely.