Make spawn egg colours visible (#10158)

Co-authored-by: Yannick Lamprecht <1420893+yannicklamprecht@users.noreply.github.com>

patches/api/Add-api-for-spawn-egg-texture-colors.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Luis <luisc99@icloud.com>
+Date: Thu, 11 Jan 2024 19:58:17 +0100
+Subject: [PATCH] Add api for spawn egg texture colors
+
+
+diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/UnsafeValues.java
++++ b/src/main/java/org/bukkit/UnsafeValues.java
+@@ -0,0 +0,0 @@ public interface UnsafeValues {
+ 
+     String getStatisticCriteriaKey(@NotNull org.bukkit.Statistic statistic);
+     // Paper end
++
++    // Paper start - spawn egg color visibility
++    /**
++     * Obtains the underlying color informating for a spawn egg of a given
++     * entity type, or null if the entity passed does not have a spawn egg.
++     * Spawn eggs have two colors - the background layer (0), and the
++     * foreground layer (1)
++     * @param entityType The entity type to get the color for
++     * @param layer The texture layer to get a color for
++     * @return The color of the layer for the entity's spawn egg
++     */
++    @Nullable org.bukkit.Color getSpawnEggLayerColor(org.bukkit.entity.EntityType entityType, int layer);
++    // Paper end - spawn egg color visibility
+ }