change packageName, dotnetVersion, sdkClassName

Author: 2ynn

gen.yaml

@@ -1,6 +1,6 @@
 configVersion: 2.0.0
 generation:
-  sdkClassName: Speakeasy
+  sdkClassName: SpeakeasySDK
   usageSnippets:
     optionalPropertyRendering: withExample
   fixes:
@@ -15,7 +15,7 @@ csharp:
   author: Speakeasy
   clientServerStatusCodesAsErrors: true
   disableNamespacePascalCasingApr2024: false
-  dotnetVersion: net5.0
+  dotnetVersion: net8.0
   flattenGlobalSecurity: false
   imports:
     option: openapi
@@ -28,5 +28,5 @@ csharp:
   inputModelSuffix: input
   maxMethodParams: 0
   outputModelSuffix: output
-  packageName: SpeakeasySDK
+  packageName: Speakeasy.Client.SDK
   responseFormat: envelope