feat: ULID PK를 가지는 추상 엔티티 추가

- https://spoqa.github.io/2022/08/16/kotlin-jpa-entity.html

src/main/kotlin/kr/galaxyhub/sc/common/domain/PrimaryKeyEntity.kt

@@ -0,0 +1,52 @@
+package kr.galaxyhub.sc.common.domain
+
+import com.github.f4b6a3.ulid.UlidCreator
+import jakarta.persistence.Column
+import jakarta.persistence.Id
+import jakarta.persistence.MappedSuperclass
+import jakarta.persistence.PostLoad
+import jakarta.persistence.PostPersist
+import java.util.Objects
+import java.util.UUID
+import org.hibernate.proxy.HibernateProxy
+import org.springframework.data.domain.Persistable
+
+@MappedSuperclass
+abstract class PrimaryKeyEntity : Persistable<UUID> {
+
+    @Id
+    @Column(columnDefinition = "uuid")
+    private val id: UUID = UlidCreator.getMonotonicUlid().toUuid()
+
+    @Transient
+    private var _isNew = true
+
+    override fun getId(): UUID = id
+
+    override fun isNew(): Boolean = _isNew
+
+    override fun equals(other: Any?): Boolean {
+        if (other == null) {
+            return false
+        }
+        if (other !is HibernateProxy && this::class != other::class) {
+            return false
+        }
+        return id == getIdentifier(other)
+    }
+
+    private fun getIdentifier(obj: Any): Any {
+        return when (obj) {
+            is HibernateProxy -> obj.hibernateLazyInitializer.identifier
+            else -> (obj as PrimaryKeyEntity).id
+        }
+    }
+
+    override fun hashCode(): Int = Objects.hashCode(id)
+
+    @PostPersist
+    @PostLoad
+    protected fun load() {
+        _isNew = false
+    }
+}