This makes VariableHolder a true value object, and introduces a
stateless service, VariableManager, to operate on it.
Note, in theory, this new service is still cyclically coupled with
LazyVariableComputed. However, it's now two stateless service being
coupled, not two smart/god value objects, so we've still earned
something. For now, the dependency is hidden by using a callback. Some
alternatives for that are mentioned in a code comment.
Bug: T261069
Change-Id: I2f2c84c8e91472ba36084a8bbb4a923f6e04354b
Introduce ReversibleConsequence interface for Consequence classes
whose potentially destructive actions can be reverted using
Special:AbuseFilter/revert. This allows moving reverting logic from
AbuseFilterViewRevert to individual Consequence classes and testing.
Unfortunately, the code is definitely not very clean now.
Change-Id: I558da711f1645ccf64792c6102cf743827171320