add Chisu playlist functions

- add Websocket
- add API
- version up to 1.2.0

common/build.gradle.kts

@@ -34,6 +34,9 @@ dependencies {
     // https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp
     implementation("com.squareup.okhttp3:okhttp:4.12.0")
 
+    // https://mvnrepository.com/artifact/com.google.code.gson/gson
+    implementation("com.google.code.gson:gson:2.11.0")
+
     testImplementation(kotlin("test"))
 }