Add coroutineScope property to event handlers

This allows your event handlers to be launched in a coroutine scope if needed.

kord-extensions/src/main/kotlin/com/kotlindiscord/kord/extensions/ExtensibleBot.kt

@@ -346,17 +346,17 @@ public open class ExtensibleBot(
 	 */
 	public inline fun <reified T : Event> on(
 		launch: Boolean = true,
-		scope: CoroutineScope = this.getKoin().get<Kord>(),
+		scope: CoroutineScope = kordRef,
 		noinline consumer: suspend T.() -> Unit,
 	): Job =
 		events.buffer(Channel.UNLIMITED)
 			.filterIsInstance<T>()
 			.onEach {
 				runCatching {
-					if (launch) kordRef.launch { consumer(it) } else consumer(it)
+					if (launch) scope.launch { consumer(it) } else consumer(it)
 				}.onFailure { logger.catching(it) }
 			}.catch { logger.catching(it) }
-			.launchIn(scope)
+			.launchIn(kordRef)
 
 	/**
 	 * @suppress
@@ -515,7 +515,7 @@ public open class ExtensibleBot(
 	 */
 	@Throws(EventHandlerRegistrationException::class)
 	public inline fun <reified T : Event> registerListenerForHandler(handler: EventHandler<T>): Job {
-		return on<T> {
+		return on<T>(scope = handler.coroutineScope) {
 			handler.call(this)
 		}
 	}

kord-extensions/src/main/kotlin/com/kotlindiscord/kord/extensions/events/EventHandler.kt

@@ -21,6 +21,7 @@ import com.kotlindiscord.kord.extensions.utils.getKoin
 import dev.kord.core.Kord
 import dev.kord.core.event.Event
 import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import org.koin.core.component.inject
 import java.util.*
@@ -73,6 +74,13 @@ public open class EventHandler<T : Event>(
 	/** Cached locale variable, stored and retrieved by [getLocale]. **/
 	public var resolvedLocale: Locale? = null
 
+	/**
+	 * Coroutine scope used to launch this event handler when handling a new event.
+	 *
+	 * Defaults to the current [Kord] instance.
+	 */
+	public var coroutineScope: CoroutineScope = kord
+
 	/**
 	 * An internal function used to ensure that all of an event handler's required arguments are present.
 	 *