onMessageReactionCount   
  inline fun Bot.onMessageReactionCount(sequence: SubscribeSequence = NORMAL, crossinline processor: suspend (Event, messageReactionCount: MessageReactionCountUpdated) -> Unit)
Register processor for MessageReactionCountUpdated named MESSAGE_REACTION_COUNT_NAME
Equivalent to the following:
// process or preProcess
bot.subscribe<MessageReactionCountUpdated>(sequence, MESSAGE_REACTION_COUNT_NAME) { event, messageReactionCount ->
    // ...
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