Add Commit Statistics Portlet for Pull Request Monitoring Plugin

[simonsymhoven]

Provide a portlet for the pull request monitoring plugin. I used the new CommitStatisticsBuildAction and the corresponding CommitStatistics of PR-303 to deliver one portlet, only if a reference build is defined for the run:

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[uhafner]

Can you please rebase? I updated all plugin dependencies now. I think some PMD warnings need to be fixed as well.

[uhafner]

After looking again at the sources I noticed that the change actually is not related to the Git implementation. It might be better suited for the forensics-api plugin. Then we can reuse the portlet for other repository implementations.

[simonsymhoven]

After looking again at the sources I noticed that the change actually is not related to the Git implementation. It might be better suited for the forensics-api plugin. Then we can reuse the portlet for other repository implementations.

Yes that's true. I will implement these changes in the forensics-api-plugin and create a new pull request.