Add debug logging to bootstrap launch methods

Inserted GeneralTracer.Debug statements at the start of LaunchAsync methods in GeneralClientBootstrap and GeneralUpdateBootstrap to improve traceability of bootstrap launches.

Author: JusterZhu

src/c#/GeneralUpdate.ClientCore/GeneralClientBootstrap.cs

@@ -45,6 +45,7 @@ public override async Task<GeneralClientBootstrap> LaunchAsync()
     {
         try
         {
+            GeneralTracer.Debug("GeneralClientBootstrap Launch.");
             CallSmallBowlHome(_configInfo.Bowl);
             ExecuteCustomOptions();
             await ExecuteWorkflowAsync();

src/c#/GeneralUpdate.Core/GeneralUpdateBootstrap.cs

@@ -59,6 +59,7 @@ public GeneralUpdateBootstrap()
 
         public override async Task<GeneralUpdateBootstrap> LaunchAsync()
         {
+            GeneralTracer.Debug("GeneralUpdateBootstrap Launch.");
             StrategyFactory();
             var manager =
                 new DownloadManager(_configInfo.TempPath, _configInfo.Format, _configInfo.DownloadTimeOut);