Add player animator dependency and prone knockdown pose

src/main/java/net/fretux/knockedback/KnockedManager.java

@@ -65,6 +65,7 @@ public class KnockedManager {
         knockedEntities.remove(entity.getUUID());
         grippedEntities.remove(entity.getUUID());
         MobKillHandler.clearKillAttempt(entity.getUUID());
+        entity.setForcedPose(null);
         if (entity instanceof ServerPlayer sp) {
             NetworkHandler.CHANNEL.send(
                     PacketDistributor.PLAYER.with(() -> sp),

src/main/java/net/fretux/knockedback/effects/KnockedEffect.java

@@ -1,6 +1,7 @@
 package net.fretux.knockedback.effects;
 
 import net.fretux.knockedback.KnockedManager;
+import net.minecraft.world.entity.Pose;
 import net.minecraft.world.entity.player.Player;
 import net.minecraftforge.event.entity.living.LivingEvent;
 import net.minecraftforge.event.entity.player.AttackEntityEvent;
@@ -20,6 +21,11 @@ public class KnockedEffect {
             player.hurtMarked = true;
             player.setNoGravity(false);
             player.setDeltaMovement(0, player.getDeltaMovement().y(), 0);
+            if (player.getForcedPose() != Pose.SWIMMING) {
+                player.setForcedPose(Pose.SWIMMING);
+            }
+        } else if (player.getForcedPose() == Pose.SWIMMING) {
+            player.setForcedPose(null);
         }
     }