Implement protection against user error during filter generation

### Problem

Currently, the filters compiler allows for accidental and non-obvious mistakes, such as
- deleting a large number of rules (for example, mistakenly taken as incorrect)
- adding rules with incorrect regular expressions (catastrophic backtracking).

### Proposed solution

To prevent such errors, we need a protection mechanism which will warn us if a significant change in volume occurred during filter building. Also, add a function to test the speed of regular expressions used in the rules (unescaped).
Send notification to Slack to filters chat.

Related to `ADG-6782`