Add Maven Wrapper for consistent builds

- Install Maven Wrapper 3.3.4 for build reproducibility
- Ensure consistent Maven version (3.9.14) across environments
- Add .mvn/wrapper/ directory with maven-wrapper.properties
- Add mvnw and mvnw.cmd wrapper scripts

Fixes #32

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Flossy

.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,3 @@
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://nexus.corp.redhat.com/repository/information-retrieval-maven2//org/apache/maven/apache-maven/3.9.14/apache-maven-3.9.14-bin.zip