Add kotlin extensions for `Sort`.

Signed-off-by: NillPoe <nillpoe@pm.me>

src/main/kotlin/org/springframework/data/domain/SortExtensions.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2026-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.domain
+
+import org.springframework.data.mapping.toDotPath
+import kotlin.reflect.KProperty
+
+/**
+ * Creates an ascending [Sort] based on this [KProperty].
+ *
+ * @author Yejun Ho
+ * @since 4.0.3
+ */
+fun KProperty<*>.asc(): Sort =
+    Sort.by(Sort.Direction.ASC, this.toDotPath())
+
+/**
+ * Creates a descending [Sort] based on this [KProperty].
+ *
+ * @author Yejun Ho
+ * @since 4.0.3
+ */
+fun KProperty<*>.desc(): Sort =
+    Sort.by(Sort.Direction.DESC, this.toDotPath())