C#: Introduce convenience constructor for the DependencyManager.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependencyManager.cs

@@ -143,6 +143,8 @@ public DependencyManager(string srcDir, IDependencyOptions options, ILogger logg
                 DateTime.Now - startTime);
         }
 
+        public DependencyManager(string srcDir) : this(srcDir, DependencyOptionsFactory.Default, new ConsoleLogger(Verbosity.Info)) { }
+
         private IEnumerable<string> GetFiles(string pattern, bool recurseSubdirectories = true)
         {
             return sourceDir.GetFiles(pattern, new EnumerationOptions { RecurseSubdirectories = recurseSubdirectories, MatchCasing = MatchCasing.CaseInsensitive })

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependencyOptions.cs

@@ -70,4 +70,11 @@ public class DependencyOptions : IDependencyOptions
         public bool ExcludesFile(string path) =>
             Excludes.Any(path.Contains);
     }
+
+    public class DependencyOptionsFactory
+    {
+        private static readonly DependencyOptions instance = new DependencyOptions();
+
+        public static IDependencyOptions Default => instance;
+    }
 }