add skin part caching

src/main/java/cc.fascinated/model/cache/CachedPlayerSkinPart.java

@@ -0,0 +1,22 @@
+package cc.fascinated.model.cache;
+
+import lombok.*;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.redis.core.RedisHash;
+
+@Setter
+@Getter
+@AllArgsConstructor
+@RedisHash(value = "player", timeToLive = 60L * 60L) // 1 hour (in seconds)
+public class CachedPlayerSkinPart {
+
+    /**
+     * The ID of the skin part
+     */
+    @Id @NonNull private String id;
+
+    /**
+     * The skin part bytes
+     */
+    private byte[] bytes;
+}