Add AppConfig python configs (#31489)

Author: Yalin Li

specification/appconfiguration/AppConfiguration/client.tsp

@@ -7,12 +7,9 @@ using AzureAppConfiguration;
 
 namespace SdkCustomizations;
 
-// Cross-language customizations
-// except Java, since Java has built-in type in azure-core for Error model.
-@@clientName(Foundations.Error, "ErrorDetail", "python,csharp,javascript,go");
-
 // Python specific customizations
 @@clientName(KeyValueFields, "ConfigurationSettingFields", "python");
 @@clientName(CompositionType, "SnapshotComposition", "python");
 @@access(putKeyValue, Access.internal, "python");
 @@access(updateSnapshot, Access.internal, "python");
+@@access(SnapshotUpdateParameters, Access.public, "python");

specification/appconfiguration/AppConfiguration/tspconfig.yaml

@@ -15,6 +15,7 @@ options:
   "@azure-tools/typespec-python":
     package-dir: "azure-appconfiguration"
     package-name: "{package-dir}"
+    package-pprint-name: "App Configuration Data"
     package-mode: dataplane
     flavor: azure
     generate-test: true