Add tagging system to jobs

It would be nice to be able to :
* add tags to jobs (not job name)
* find them by tag (in order to delete them)

Indeed sometimes we create lot of jobs and we need to delete later if they are not completed.

Use case: An user creates a product on a platform and needs to synchronize them via backgroundjobs. However the user deletes the product before the synchronization jobs occurs so I need to have a mechanism to find all jobs linked to this product (here the tag might be "product-"+productId and delete them.