feat: replace gson with kotlinx-serialization

Signed-off-by: qwq233 <qwq233@qwq2333.top>

build.gradle.kts

@@ -1,9 +1,32 @@
+/*
+ * QAuxiliary - An Xposed module for QQ/TIM
+ * Copyright (C) 2019-2022 qwq233@qwq2333.top
+ * https://github.com/cinit/QAuxiliary
+ *
+ * This software is non-free but opensource software: you can redistribute it
+ * and/or modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version and our eula as published
+ * by QAuxiliary contributors.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * and eula along with this software.  If not, see
+ * <https://www.gnu.org/licenses/>
+ * <https://github.com/cinit/QAuxiliary/blob/master/LICENSE.md>.
+ */
+
 import com.android.build.gradle.BaseExtension
 
 plugins {
     id("com.android.application") version "7.2.1" apply false
     id("com.android.library") version "7.2.1" apply false
     id("org.jetbrains.kotlin.android") version Version.kotlin apply false
+    kotlin("plugin.serialization") version Version.kotlin apply false
 }
 
 tasks.register<Delete>("clean").configure {