feat(database): add support for Pigeon. Update iOS to Swift and Android to Kotlin

packages/firebase_data_connect/firebase_data_connect/example/android/app/local-config.gradle

@@ -3,5 +3,5 @@ ext {
     minSdk=23
     targetSdk=34
     javaVersion = JavaVersion.toVersion(17)
-    androidGradlePluginVersion = '8.3.0'
+    androidGradlePluginVersion = '8.6.0'
 }

packages/firebase_data_connect/firebase_data_connect/example/android/settings.gradle

@@ -22,7 +22,7 @@ plugins {
     // START: FlutterFire Configuration
     id "com.google.gms.google-services" version "4.3.15" apply false
     // END: FlutterFire Configuration
-    id "org.jetbrains.kotlin.android" version "1.9.22" apply false
+    id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }
 
 include ":app"

packages/firebase_database/analysis_options.yaml

@@ -0,0 +1,11 @@
+# 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_database_platform_interface/lib/src/pigeon/messages.pigeon.dart
+    - firebase_database_platform_interface/test/pigeon/test_api.dart
+    - firebase_database_platform_interface/pigeons/messages.dart

packages/firebase_database/firebase_database/android/build.gradle

@@ -2,6 +2,7 @@ group 'io.flutter.plugins.firebase.database'
 version '1.0-SNAPSHOT'
 
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 apply from: file("local-config.gradle")
 
 buildscript {
@@ -49,6 +50,18 @@ android {
         targetCompatibility project.ext.javaVersion
     }
 
+    kotlinOptions {
+        jvmTarget = project.ext.javaVersion
+    }
+
+    sourceSets {
+        main {
+            java {
+                srcDirs = ['src/main/kotlin']
+            }
+        }
+    }
+
     buildFeatures {
         buildConfig = true
     }

packages/firebase_database/firebase_database/android/local-config.gradle

@@ -3,5 +3,5 @@ ext {
     minSdk=23
     targetSdk=34
     javaVersion = JavaVersion.toVersion(17)
-    androidGradlePluginVersion = '8.3.0'
+    androidGradlePluginVersion = '8.6.0'
 }