Add a way to tag all tests with the CLI

[mikkilevon]

At the moment if one want's to consolidate 2 different levels of tests inside a repository and have them tagged as different test levels (f.ex unit tests and integration tests) one has to first run oxygen for both the files, then run rebot for both files to tag them differently and then use rebot to consolidate the files

[Tattoo]

Possibly enhance the cli() method in BaseHandler so tags can be added per handler