Fixed some events lack of SerialName.

core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/PulseFreeTimeBeatEvent.kt

@@ -5,6 +5,7 @@ package cn.rdlevel.rdkt.core.events
 
 import cn.rdlevel.rdkt.core.annotations.RDKTInternalAPI
 import cn.rdlevel.rdkt.core.serialization.TransformSerializer
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlin.jvm.JvmOverloads
 
@@ -15,6 +16,7 @@ import kotlin.jvm.JvmOverloads
  * @property hold The hold time this pulse will last in beats. 0 means disable the hold.
  */
 @Serializable(PulseFreeTimeBeatEvent.Serializer::class)
+@SerialName("PulseFreeTimeBeat")
 public data class PulseFreeTimeBeatEvent @JvmOverloads constructor(
     var action: Action = Action.Increment,
     var hold: Int = 0,

core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/SetBeatSoundEvent.kt

@@ -10,6 +10,7 @@ import kotlinx.serialization.Serializable
  * @property sound The pulse sound [AudioData] to set for the specified row.
  */
 @Serializable
+@SerialName("SetBeatSound")
 public data class SetBeatSoundEvent(
     var sound: AudioData,
 ) : BeatSpecificSoundEvent(), RowSpecificEvent {