Exclude tags in subscriptions

[phuntik]

FEATURE

Add ability to exclude specific tags in subscriptions from being processed.

Summary

Case:
There is a set of tags, which all belong to some general tag.
Subscription, by default, is based on general tag.
If we need to notify only some tags in this set, right now it is possible to do only by creation an exact number of explicit subscriptions with concatenation of general tag and specific tag, excluding the one we need to exclude.
Its ok when there are only few of such combinations but things getting worse when there are tons of combos.

Example, lets say we have apps in services, so:
Initial sub:

service1

We want to do:

service1 exclude app3

What we have to do now:

service1 & app1
service1 & app2
...
service1 & appN 

original discussion in TG: https://t.me/moira_alert/6028

[phuntik]

It would be nice to see it in a some kind of this way, as per my example: