Add Codable conformance to common Foundation types

Add conformances + unit tests for

* CGFloat
* AffineTransform
* Calendar
* CharacterSet
* DateComponents
* DateInterval
* Decimal
* IndexPath
* IndexSet
* Locale
* Measurement
* NSRange
* PersonNameComponents
* TimeZone
* URL
* UUID

along with some unit tests for each.

stdlib/public/SDK/Foundation/NSRange.swift

@@ -172,3 +172,17 @@ extension NSRange : CustomPlaygroundQuickLookable {
     }
 }
 
+extension NSRange : Codable {
+    public init(from decoder: Decoder) throws {
+        var container = try decoder.unkeyedContainer()
+        let location = try container.decode(Int.self)
+        let length = try container.decode(Int.self)
+        self.init(location: location, length: length)
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.unkeyedContainer()
+        try container.encode(self.location)
+        try container.encode(self.length)
+    }
+}