aspnetcore: multiplexing for updates (#5852)

* aspcore: add platform multiple queries

* Add missing console output

* tweak postgresql connectionstring

* aspnetcore: multiplexing for updates

Co-authored-by: Stefan Negulescu <[email protected]>

frameworks/CSharp/aspnetcore/PlatformBenchmarks/appsettings.postgresql.updates.json

@@ -1,4 +1,4 @@
 {
-  "ConnectionString": "Server=tfb-database;Database=hello_world;User Id=benchmarkdbuser;Password=benchmarkdbpass;Maximum Pool Size=64;NoResetOnClose=true;Enlist=false;Max Auto Prepare=3",
+  "ConnectionString": "Server=tfb-database;Database=hello_world;User Id=benchmarkdbuser;Password=benchmarkdbpass;Maximum Pool Size=64;NoResetOnClose=true;Enlist=false;Max Auto Prepare=3;Multiplexing=true;Write Coalescing Delay Us=500;Write Coalescing Buffer Threshold Bytes=1000",
   "Database": "postgresql"
 }