Modernize RESTEasy Development Tools

[jamezp]

This PR modernizes the resteasy-dev-tools repository for the Maven Central publisher migration and streamlines the configuration artifacts for use with Spotless.

🔴 Breaking Changes

• Removed parent-pom module - The dev.resteasy.tools:resteasy-parent artifact is no longer published
  • Downstream projects should inherit from org.jboss:jboss-parent directly
  • Formatter and checkstyle configurations remain available via ide-config and resteasy-checkstyle-config artifacts
  • This eliminates the 3-step release dependency chain and allows projects to update jboss-parent independently

✨ New Features

Release Automation

• Added release.sh script for streamlined releases to Maven Central
  • See README.adoc for full usage documentation

Maven Wrapper

• Added Maven wrapper for consistent builds across environments
• No longer requires system Maven installation

License Headers

• Added license-java-asl-header for Java files
• Added license-xml-asl-header for XML files
• Ready for use with Spotless configuration

Projects using dev.resteasy.tools:resteasy-parent should:

1. Change parent POM to inherit from jboss-parent directly:

<parent>
    <groupId>org.jboss</groupId>
    <artifactId>jboss-parent</artifactId>
    <version>53</version>
</parent>

3. Add Spotless plugin with resteasy-dev-tools configurations:

<plugin>
    <groupId>com.diffplug.spotless</groupId>
    <artifactId>spotless-maven-plugin</artifactId>
    <dependencies>
        <dependency>
            <groupId>dev.resteasy.tools</groupId>
            <artifactId>ide-config</artifactId>
            <version>4</version>
        </dependency>
    </dependencies>
    <configuration>
        <java>
            <eclipse>
                <file>eclipse-code-formatter.xml</file>
            </eclipse>
            <importOrder>
                <order>\#,java,javax,jakarta,org,io,dev,com,net</order>
            </importOrder>
            <removeUnusedImports/>
            <licenseHeader>
                <file>license-java-asl-header</file>
            </licenseHeader>
        </java>
    </configuration>
</plugin>

5. Add Checkstyle plugin (optional):

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-checkstyle-plugin</artifactId>
    <dependencies>
        <dependency>
            <groupId>dev.resteasy.tools</groupId>
            <artifactId>resteasy-checkstyle-config</artifactId>
            <version>4</version>
        </dependency>
    </dependencies>
    <configuration>
        <configLocation>resteasy-checkstyle/checkstyle.xml</configLocation>
    </configuration>
</plugin>