Parent Dependency Version Tracking

[rbuisson]

As a user of the dependency-tracker-maven-plugin, I want to monitor version changes in parent declaration of Maven projects, in addition to the existing dependencies tracking, so that I can have a comprehensive view of all dependency updates affecting my project.

Acceptance Criteria

• The plugin should detect and track version changes in the declaration of Maven projects.
• When a parent version change is detected, it should be reported alongside other dependency changes.
• Users should be able to configure whether they want to track parent version changes or not through a configuration option, that would default to true.
• The plugin should handle projects with no parent declaration gracefully, without throwing errors.
• The documentation should be updated to reflect the new parent version tracking feature, including usage instructions and configuration options.
• The plugin should maintain backwards compatibility with previous versions.

Out of Scope

• Tracking changes of the dependencies of the parent itself.

Technical Notes

Implement a new method to extract and compare parent versions from pom.xml files.
Modify the existing reporting mechanism (dependency report file) to include parent version changes.
Add a new configuration parameter (e.g., trackParentVersion) to enable/disable this feature, enabled by default.
Update unit tests to cover the new functionality.