Add command to dump injector cache list.

To allow me to figure out how big it is.

Resources/Locale/en-US/commands.ftl

@@ -529,3 +529,7 @@ cmd-vv-desc = Usage: vv <path|entity ID|guihover>
 
 cmd-vvinvoke-desc = Invoke/Call a path with arguments using VV.
 cmd-vvinvoke-desc = Usage: vvinvoke <path> [arguments...]
+
+cmd-dump_dependency_injectors-desc = Dump IoCManager's dependency injector cache.
+cmd-dump_dependency_injectors-help = Usage: dump_dependency_injectors
+cmd-dump_dependency_injectors-total-count = Total count: { $total }

Robust.Shared/Console/Commands/DumpDependencyInjectors.cs

@@ -0,0 +1,25 @@
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Robust.Shared.Console.Commands;
+
+internal sealed class DumpDependencyInjectors : LocalizedCommands
+{
+    [Dependency] private readonly IDependencyCollection _dependencies = default!;
+
+    public override string Command => "dump_dependency_injectors";
+
+    public override void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        var deps = (DependencyCollection)_dependencies;
+
+        var types = deps.GetCachedInjectorTypes();
+
+        foreach (var type in types)
+        {
+            shell.WriteLine(type.FullName ?? "");
+        }
+
+        shell.WriteLine(Loc.GetString("cmd-dump_dependency_injectors-total-count", ("total", types.Length)));
+    }
+}

Robust.Shared/IoC/DependencyCollection.cs

@@ -83,6 +83,12 @@ namespace Robust.Shared.IoC
                 : _services.Keys;
         }
 
+        public Type[] GetCachedInjectorTypes()
+        {
+            using var _ = _injectorCacheLock.ReadGuard();
+            return _injectorCache.Where(kv => kv.Value.Delegate != null).Select(kv => kv.Key).ToArray();
+        }
+
         /// <inheritdoc />
         public bool TryResolveType<T>([NotNullWhen(true)] out T? instance)
         {