Switch to Maven build system

[tonit]

Switch to the Maven build system from Gradle.

• Add Maven build configuration:
  • Add pom.xml with project information, dependencies, and build plugins.
• Add GitHub Actions workflows for Maven:
  • Add .github/workflows/maven-build.yml for Maven build and test with JDK 17.
  • Add .github/workflows/maven.yml for Maven build with JDK 1.8.
• Update Gitpod configuration:
  • Modify .gitpod.yml to use Maven commands for the init task.
• Remove Gradle-related files:
  • Delete .github/workflows/gradle-build.yml.
  • Delete .github/workflows/gradle.yml.
  • Delete gradle/wrapper/gradle-wrapper.properties.
  • Delete gradlew.
  • Delete gradlew.bat.
  • Delete gradle.properties.
  • Delete settings.gradle.

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For more details, open the Copilot Workspace session.