Add Maven plugin integration for ExpandWildcardImportsStep

[Copilot]

ExpandWildcardImportsStep was already implemented in lib and Gradle plugin but not available in Maven plugin. The step requires a Collection<File> typeSolverClasspath containing project sources and dependencies for type resolution.

Changes

Configuration chain extended to pass MavenProject:

• Added MavenProject field to FormatterConfig and FormatterStepConfig
• Updated FormatterFactory and AbstractSpotlessMojo to propagate project reference

Created ExpandWildcardImports FormatterStepFactory:

• Collects all compile and test source roots via getCompileSourceRoots() and getTestCompileSourceRoots()
• Gathers project artifacts for dependency resolution
• Constructs typeSolverClasspath and delegates to existing ExpandWildcardImportsStep.create()

Integration:

• Added addExpandWildcardImports() method to Java formatter
• Documented usage in Maven plugin README
• Created integration test reusing existing test resources

Usage

<configuration>
  <java>
    <expandWildcardImports/>
  </java>
</configuration>

Transforms:

import java.util.*;
import foo.bar.baz.*;

Into:

import java.util.List;
import java.util.Map;
import foo.bar.baz.AnotherImportedClass;

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• archive.eclipse.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:MaxMetaspaceSize=1024m -Xmx4g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)
• java.sun.com
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.23.9/x64/codeql/tools/linux64/java/bin/java /opt/hostedtoolcache/CodeQL/2.23.9/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.9/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/spotless/.codeql-scratch/dbs/java/working/files-to-index2995331916609997450.list --sourceArchiveDir=/home/REDACTED/work/spotless/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/spotless/.codeql-scratch/dbs/java/trap/java (dns block)
• scans-in.gradle.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -XX:MaxMetaspaceSize=1024m -Xmx4g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix diffplug#2829

• ExpandWildcardImportsStep is already implemented in lib/src/main/java/com/diffplug/spotless/java/ExpandWildcardImportsStep.java and integrated with gradle plugin
• we want to implement maven plugin integration for the same
• the main challenge is that ExpandWildcardImportsStep needs a Collection typeSolverClasspath to pass to java parser, so we need to create that using information from maven project and pass it to the the step

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