Migrate Maven wrapper to script-only (3.3.4)

Remove the committed maven-wrapper.jar and switch the Maven Wrapper to script-only form (wrapperVersion=3.3.4). Update .mvn/wrapper/maven-wrapper.properties to use distributionType=only-script and point distributionUrl to an aliyun mirror for apache-maven-3.9.9. Add platform wrappers mvnw (unix, executable) and mvnw.cmd (Windows) to download and install the Maven distribution at runtime. This reduces committed binary artifacts and updates the wrapper and Maven versions.

Author: mercyblitz

.mvn/wrapper/maven-wrapper.jar

@@ -1,16 +1,3 @@
-# Copyright 2013-2023 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.
-
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.0/apache-maven-3.9.0-bin.zip
-wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://maven.aliyun.com/repository/public/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip