feat(scripting): config interface

- change onLaunched to onDispose
- refactor JSModule extras

app/src/main/kotlin/me/rhunk/snapenhance/RemoteSideContext.kt

@@ -14,6 +14,8 @@ import coil.ImageLoader
 import coil.decode.VideoFrameDecoder
 import coil.disk.DiskCache
 import coil.memory.MemoryCache
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import me.rhunk.snapenhance.bridge.BridgeService
@@ -81,6 +83,8 @@ class RemoteSideContext(
             .components { add(VideoFrameDecoder.Factory()) }.build()
     }
 
+    val gson: Gson by lazy { GsonBuilder().setPrettyPrinting().create() }
+
     fun reload() {
         log.verbose("Loading RemoteSideContext")
         runCatching {