C#: Add more Map like remote flow source testcases.

Author: michaelnebel

csharp/ql/test/library-tests/dataflow/flowsources/aspremote/AspRemoteFlowSource.cs

@@ -25,7 +25,7 @@ public object MyAction(ViewModel viewModel)
 
     public class AspRoutingEndpoints
     {
-        public delegate void MapGetHandler(string delegateparam);
+        public delegate void MapGetHandler(string param);
 
         public void HandlerMethod(string param) { }
 
@@ -42,7 +42,12 @@ public void M1(string[] args)
             app.MapGet("/api/redirect/{lambdaParam}", handler);
 
             MapGetHandler handler2 = HandlerMethod;
-            app.MapGet("/api/redirect/{param}", handler2);
+            app.MapGet("/api/redirect/{mapGetParam}", handler2);
+
+            app.MapPost("/api/redirect/{mapPostParam}", (string mapPostParam) => { });
+            app.MapPut("/api/redirect/{mapPutParam}", (string mapPutParam) => { });
+            app.MapDelete("/api/redirect/{mapDeleteParam}", (string mapDeleteParam) => { });
+
             app.Run();
         }
     }

csharp/ql/test/library-tests/dataflow/flowsources/aspremote/aspRemoteFlowSource.expected

@@ -7,3 +7,6 @@ remoteFlowSources
 | AspRemoteFlowSource.cs:39:61:39:65 | myApi |
 | AspRemoteFlowSource.cs:39:75:39:79 | myUrl |
 | AspRemoteFlowSource.cs:41:46:41:56 | lambdaParam |
+| AspRemoteFlowSource.cs:47:65:47:76 | mapPostParam |
+| AspRemoteFlowSource.cs:48:63:48:73 | mapPutParam |
+| AspRemoteFlowSource.cs:49:69:49:82 | mapDeleteParam |