Add download cleaner and dry run (#58)

code/Infrastructure/Verticals/ContentBlocker/IFilenameEvaluator.cs

@@ -0,0 +1,10 @@
+using System.Collections.Concurrent;
+using System.Text.RegularExpressions;
+using Common.Configuration.ContentBlocker;
+
+namespace Infrastructure.Verticals.ContentBlocker;
+
+public interface IFilenameEvaluator
+{
+    bool IsValid(string filename, BlocklistType type, ConcurrentBag<string> patterns, ConcurrentBag<Regex> regexes);
+}