feat(remote_config): add support for Pigeon. Update iOS to Swift and Android to Swift (#17489)

* feat(remote_config): add support for Pigeon. Update iOS to Swift and Android to Swift

* chore: migrate ios implementation to Swift

* chore: add license header to FirebaseRemoteConfigUtils.swift

* chore: reference `binaryMessenger`

* chore: fix ci

* chore: remove uncecessary log

Author: SelaseKay

packages/firebase_remote_config/analysis_options.yaml

@@ -0,0 +1,10 @@
+# Copyright 2025 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# in the LICENSE file.
+
+include: ../../analysis_options.yaml
+
+analyzer:
+  exclude:
+    - firebase_remote_config_platform_interface/lib/src/pigeon/messages.pigeon.dart
+    - firebase_remote_config_platform_interface/test/pigeon/test_api.dart

packages/firebase_remote_config/firebase_remote_config/android/build.gradle

@@ -5,6 +5,7 @@ apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
 buildscript {
+    ext.kotlin_version = "1.8.22"
     repositories {
         google()
         mavenCentral()
@@ -18,6 +19,8 @@ rootProject.allprojects {
     }
 }
 
+apply plugin: 'kotlin-android'
+
 def firebaseCoreProject = findProject(':firebase_core')
 if (firebaseCoreProject == null) {
     throw new GradleException('Could not find the firebase_core FlutterFire plugin, have you added it as a dependency in your pubspec?')
@@ -44,11 +47,20 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_17
+    }
+
     compileOptions {
         sourceCompatibility project.ext.javaVersion
         targetCompatibility project.ext.javaVersion
     }
 
+    sourceSets {
+        main.java.srcDirs += "src/main/kotlin"
+        test.java.srcDirs += "src/test/kotlin"
+    }
+
     buildFeatures {
         buildConfig = true
     }