feat: Initial view controller dependency and snapshot tests.

Sources/ViewControllerLive/Dependencies/DateFormatter.swift

@@ -0,0 +1,28 @@
+import Dependencies
+import Foundation
+
+public extension DependencyValues {
+  var dateFormatter: DateFormatter {
+    get { self[DateFormatter.self] }
+    set { self[DateFormatter.self] = newValue }
+  }
+}
+
+#if hasFeature(RetroactiveAttribute)
+  extension DateFormatter: @retroactive DependencyKey {
+
+    public static var liveValue: DateFormatter {
+      let formatter = DateFormatter()
+      formatter.dateStyle = .short
+      return formatter
+    }
+  }
+#else
+  extension DateFormatter: DependencyKey {
+    public static var liveValue: DateFormatter {
+      let formatter = DateFormatter()
+      formatter.dateStyle = .short
+      return formatter
+    }
+  }
+#endif