BattleSessionItemAction
data class BattleSessionItemAction(val itemId: String, val actorUnitId: String, val targetId: String, val kind: BattleSessionActionKind = BattleSessionActionKind.ITEM, val priority: Int = 0, val speed: Int = 0, val attributes: Map<String, Any?> = emptyMap()) : BattleSessionEffectAction
BattleSession 中最小可用的物品使用行动。