Add maven package in stdlib

Signed-off-by: Alvise <vitalvise@gmail.com>

stdlib/java/maven/tests/testdata/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

stdlib/java/maven/tests/testdata/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.5.2</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>io.dagger.maven</groupId>
+	<artifactId>spring-boot-test</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>spring-boot-test</name>
+	<description>Dagger maven spring boot test</description>
+	<properties>
+		<java.version>11</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

stdlib/java/maven/tests/testdata/src/main/java/io/dagger/maven/springboottest/SpringBootTestApplication.java

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+package io.dagger.maven.springboottest;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringBootTestApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringBootTestApplication.class, args);
+	}
+
+}

stdlib/java/maven/tests/testdata/src/main/resources/application.properties

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+

stdlib/java/maven/tests/testdata/src/test/java/io/dagger/maven/springboottest/SpringBootTestApplicationTests.java

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+package io.dagger.maven.springboottest;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SpringBootTestApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}