Don't warn about Foundation.NSString (#4)

Examples like this are fine:

	class MyCustomCell : UITableViewCell
	{
		static readonly NSString MyCellId = new NSString("MyCustomCell");
	}

MemoryAnalyzers/MemoryAnalyzers.Test/MemoryAnalyzersUnitTests.cs

@@ -214,6 +214,19 @@ class MyViewSubclass : UIView
 			await VerifyCS.VerifyAnalyzerAsync(test);
 		}
 
+		[TestMethod]
+		public async Task NSStringFieldIsOK()
+		{
+			var test = """
+				class MyCustomCell : UITableViewCell
+				{
+					static readonly NSString MyCellId = new NSString("MyCustomCell");
+				}
+			""";
+
+			await VerifyCS.VerifyAnalyzerAsync(test);
+		}
+
 		[TestMethod]
 		public async Task UIView_CAShapeLayer()
 		{

MemoryAnalyzers/MemoryAnalyzers.Test/Verifiers/CSharpCodeFixVerifier`2.cs

@@ -98,7 +98,7 @@ public UnconditionalSuppressMessageAttribute(string category, string checkId)
 				}
 			""");
 
-			// Foundation.NSObject
+			// Foundation
 			testState.Sources.Add("""
 				namespace Foundation;
 
@@ -120,33 +120,32 @@ public RegisterAttribute(string name, bool isWrapper)
 
 				[Register("NSObject", isWrapper: true)]
 				class NSObject { }
+
+				[Register("NSString", isWrapper: true)]
+				class NSString : NSObject
+				{
+					public NSString(string text) { }
+				}
 			""");
 
-			// UIKit.UIView
+			// UIKit
 			testState.Sources.Add("""
 				namespace UIKit;
 
 				[Register("UIView", isWrapper: true)]
 				class UIView : NSObject { }
-			""");
-
-			// UIKit.UIColor
-			testState.Sources.Add("""
-				namespace UIKit;
 
 				[Register("UIColor", true)]
 				class UIColor : NSObject { }
-			""");
-
-			// UIKit.UIImage
-			testState.Sources.Add("""
-				namespace UIKit;
 
 				[Register("UIImage", true)]
 				class UIImage : NSObject { }
+
+				[Register("UITableViewCell", true)]
+				class UITableViewCell : UIView { }
 			""");
 
-			// CoreAnimation.CALayer
+			// CoreAnimation
 			testState.Sources.Add("""
 				namespace CoreAnimation;
 

MemoryAnalyzers/MemoryAnalyzers/MemoryAnalyzer.cs

@@ -25,6 +25,8 @@ static readonly HashSet<(string Namespace, string Name)> GenerallySafe = new()
 			{ ("UIKit", "UIColor") },
 			// UIImage is fine
 			{ ("UIKit", "UIImage") },
+			// NSString is fine
+			{ ("Foundation", "NSString") },
 		};
 
 		/// <summary>