feat(functions): migrate cloud functions Apple implementation to Swift (#17232)

* feat: migrate cloud functions ios implementation to swift

* chore: delete Obj C code and modifications

* chore: delete obj c files in macos directory

* chore: add symlink to ios file in macos

* chore: resolve comments

* chore: change error code to IllegalArgumentException

Author: SelaseKay

packages/cloud_functions/cloud_functions/ios/cloud_functions.podspec

@@ -24,10 +24,11 @@ Pod::Spec.new do |s|
   s.license          = { :file => '../LICENSE' }
   s.authors           = 'The Chromium Authors'
   s.source           = { :path => '.' }
-  s.source_files     = 'cloud_functions/Sources/cloud_functions/**/*.{h,m}'
-  s.public_header_files = 'cloud_functions/Sources/cloud_functions/include/*.h'
+  s.source_files = 'cloud_functions/Sources/**/*.swift'
   s.ios.deployment_target = '13.0'
 
+  s.swift_version = '5.0'
+
   # Flutter dependencies
   s.dependency 'Flutter'
 
@@ -37,7 +38,6 @@ Pod::Spec.new do |s|
 
   s.static_framework = true
   s.pod_target_xcconfig = {
-    'GCC_PREPROCESSOR_DEFINITIONS' => "LIBRARY_VERSION=\\\"#{library_version}\\\" LIBRARY_NAME=\\\"flutter-fire-fn\\\"",
     'DEFINES_MODULE' => 'YES'
   }
 end

packages/cloud_functions/cloud_functions/ios/cloud_functions/Package.swift

@@ -104,11 +104,6 @@ let package = Package(
       ],
       resources: [
         .process("Resources"),
-      ],
-      cSettings: [
-        .headerSearchPath("include"),
-        .define("LIBRARY_VERSION", to: "\"\(library_version)\""),
-        .define("LIBRARY_NAME", to: "\"flutter-fire-fn\""),
       ]
     ),
   ]

packages/cloud_functions/cloud_functions/ios/cloud_functions/Sources/cloud_functions/Constants.swift

@@ -0,0 +1,6 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Auto-generated file. Do not edit.
+public let versionNumber = "5.3.4"