Add API to retrieve an attribute modifier from a UUID (#9924)

* Add attribute modifier from UUID API

* Add method to remove by UUID

* Add overload for UnmodifiableAttributeInstance, better precondition messages

* rebase

patches/api/0447-Add-UUID-attribute-modifier-API.patch

@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: TonytheMacaroni <tonythemacaroni123@gmail.com>
+Date: Thu, 9 Nov 2023 20:35:35 -0500
+Subject: [PATCH] Add UUID attribute modifier API
+
+
+diff --git a/src/main/java/org/bukkit/attribute/AttributeInstance.java b/src/main/java/org/bukkit/attribute/AttributeInstance.java
+index 5513174ea545bb5b4fdc028cbaa4c1bb763e2c6d..3cffffe8106387847b10ac39f96687bb075ef686 100644
+--- a/src/main/java/org/bukkit/attribute/AttributeInstance.java
++++ b/src/main/java/org/bukkit/attribute/AttributeInstance.java
+@@ -39,6 +39,23 @@ public interface AttributeInstance {
+     @NotNull
+     Collection<AttributeModifier> getModifiers();
+ 
++    // Paper start
++    /**
++     * Gets the modifier with the corresponding UUID.
++     *
++     * @param uuid the UUID of the modifier
++     * @return the modifier, if it exists
++     */
++    @org.jetbrains.annotations.Nullable AttributeModifier getModifier(@NotNull java.util.UUID uuid);
++
++    /**
++     * Remove a modifier with the corresponding UUID from this instance.
++     *
++     * @param uuid the UUID of the modifier
++     */
++    void removeModifier(@NotNull java.util.UUID uuid);
++    // Paper end
++
+     /**
+      * Add a modifier to this instance.
+      *