ExperienceOrbs API for Reason/Source/Triggering player

Adds lots of information about why this orb exists.

Replaces isFromBottle() with logic that persists entity reloads too.

paper-server/patches/sources/net/minecraft/world/entity/npc/Villager.java.patch

@@ -24,25 +24,25 @@
      }
  
      @Override
-@@ -214,7 +222,18 @@
- 
-     public boolean assignProfessionWhenSpawned() {
+@@ -216,7 +224,18 @@
          return this.assignProfessionWhenSpawned;
-+    }
-+
+     }
+ 
 +    // Spigot Start
-+    @Override
+     @Override
 +    public void inactiveTick() {
 +        // SPIGOT-3874, SPIGOT-3894, SPIGOT-3846, SPIGOT-5286 :(
 +        if (this.level().spigotConfig.tickInactiveVillagers && this.isEffectiveAi()) {
 +            this.customServerAiStep((ServerLevel) this.level());
 +        }
 +        super.inactiveTick();
-     }
++    }
 +    // Spigot End
- 
-     @Override
++
++    @Override
      protected void customServerAiStep(ServerLevel world) {
+         ProfilerFiller gameprofilerfiller = Profiler.get();
+ 
 @@ -235,7 +254,7 @@
                      this.increaseProfessionLevelOnUpdate = false;
                  }
@@ -100,6 +100,15 @@
              Logger logger = Villager.LOGGER;
  
              Objects.requireNonNull(logger);
+@@ -599,7 +630,7 @@
+         }
+ 
+         if (offer.shouldRewardExp()) {
+-            this.level().addFreshEntity(new ExperienceOrb(this.level(), this.getX(), this.getY() + 0.5D, this.getZ(), i));
++            this.level().addFreshEntity(new ExperienceOrb(this.level(), this.getX(), this.getY() + 0.5D, this.getZ(), i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTradingPlayer(), this)); // Paper
+         }
+ 
+     }
 @@ -618,7 +649,7 @@
  
      @Override

paper-server/patches/sources/net/minecraft/world/entity/npc/WanderingTrader.java.patch

@@ -44,6 +44,15 @@
                  }
  
              }
+@@ -190,7 +208,7 @@
+         if (offer.shouldRewardExp()) {
+             int i = 3 + this.random.nextInt(4);
+ 
+-            this.level().addFreshEntity(new ExperienceOrb(this.level(), this.getX(), this.getY() + 0.5D, this.getZ(), i));
++            this.level().addFreshEntity(new ExperienceOrb(this.level(), this.getX(), this.getY() + 0.5D, this.getZ(), i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTradingPlayer(), this)); // Paper
+         }
+ 
+     }
 @@ -244,7 +262,7 @@
  
      private void maybeDespawn() {