Add functionality to alter tags

[matt035343]

          @adelinag08 I have tried cancelling `3cf44c20-61e3-4f45-9121-0949378bd090` multiple times, but nothing happens in the checkpoints table.

select * from crystal.checkpoints where id = '3cf44c20-61e3-4f45-9121-0949378bd090' and algorithm = 'store-auto-replenishment-crystal-orchestrator'

Also, in IAR I typically need to reset the tag somehow. I usually do this:

update crystal.checkpoints set tag = concat('mata-restart-',tag) where id = '3cf44c20-61e3-4f45-9121-0949378bd090' and algorithm = 'store-auto-replenishment-crystal-orchestrator'

Otherwise I cannot restart the algorithm, how do I do that from the snd client? From my conversations with George I understood it as it is part of the cancel feature. I see now that maybe it is not a good idea, but I still need the functionality to reset the tag. Is that a new issue?

Originally posted by @matt035343 in #63 (comment)

As discussed offline, I am opening a new issue to reflect a new feature related to altering/deleting tags so I can rerun my IAR jobs after they failed.