[Swift] Adds a format file and reformats the swift project (#6250)

* Formats files & adds licence

* Revert arrays

* Keeps array indentation as is

* Adds licence to code formatter

* Updates code generators

swift/Package.swift

@@ -1,22 +1,35 @@
 // swift-tools-version:5.2
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+/*
+ * Copyright 2020 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 import PackageDescription
 
 let package = Package(
-    name: "FlatBuffers",
-    platforms: [
-        .iOS(.v11),
-        .macOS(.v10_14),
-    ],
-    products: [
-        .library(
-            name: "FlatBuffers",
-            targets: ["FlatBuffers"]),
-    ],
-    targets: [
-        .target(
-            name: "FlatBuffers",
-            dependencies: []),
-    ]
-)
+  name: "FlatBuffers",
+  platforms: [
+    .iOS(.v11),
+    .macOS(.v10_14),
+  ],
+  products: [
+    .library(
+      name: "FlatBuffers",
+      targets: ["FlatBuffers"]),
+  ],
+  targets: [
+    .target(
+      name: "FlatBuffers",
+      dependencies: []),
+  ])