Swift5 use json type for any (#9206)

* [swift5] Fix additionalProps inner type

* [swift5] Add and use AnyCodable type instead of any

* [swift5] Use the original petstore w/fake models for testing default

* [swift5] Update swift-tools-version to 5.1

* [swift5] Update samples and docs

samples/client/petstore/swift5/promisekitLibrary/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.1
 
 import PackageDescription
 
@@ -19,6 +19,7 @@ let package = Package(
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
+        .package(url: "https://github.com/Flight-School/AnyCodable", .exact("0.4.0")),
         .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.12.0"),
     ],
     targets: [
@@ -26,7 +27,7 @@ let package = Package(
         // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .target(
             name: "PetstoreClient",
-            dependencies: ["PromiseKit", ],
+            dependencies: ["AnyCodable", "PromiseKit", ],
             path: "PetstoreClient/Classes"
         ),
     ]