Add different build variants

Package.swift

@@ -6,7 +6,13 @@ let package = Package(
     platforms: [.iOS(.v10), .macOS(.v10_12), .tvOS(.v10), .watchOS(.v3)],
     products: [
         .library(name: "Kingfisher", targets: ["Kingfisher"]),
-        .library(name: "KingfisherSwiftUI", targets: ["KingfisherSwiftUI"])
+        .library(name: "KingfisherSwiftUI", targets: ["KingfisherSwiftUI"]),
+        
+        .library(name: "KingfisherDynamic", type: .dynamic, targets: ["Kingfisher"]),
+        .library(name: "KingfisherSwiftUIDynamic", type: .dynamic, targets: ["KingfisherSwiftUI"]),
+        
+        .library(name: "KingfisherStatic", type: .static, targets: ["Kingfisher"]),
+        .library(name: "KingfisherSwiftUIStatic", type: .static, targets: ["KingfisherSwiftUI"])
     ],
     targets: [
         .target(