new functionality to generate a report about the PR statuses

The idea is to automatically generate a report for a set of projects, pushing the people to constantly keep CI clean and clear.

- From project-dependencies information to get the list of projects
- To be able to specify a single project (not even definition-file is required)
- To be able to filter for a range of dates (starting, ending or both)
- To be able to specify a list of PR statuses to filter
- To filter by check_run information (like name or job identifier)
- To get all the matching PRs for every project from the list
- To get all the matching check_runs per PR
- To compose a report per project/PR/check_run status

BONUS
- To get error report (in case it is somehow possible)