[UCT:Inspection] Prioritise messages

[bohdan-harniuk]

Description

The purpose of this inspection is to show only unique error messages between all possible inspection scopes. For example, if our target version is 2.4.3, our current version is 2.3.0 and some class was deprecated between those two versions and later removed, we don't need to see both messages, just that that has higher severity level.

Approximate time to develop: ~4h