onEviction should be called when deleting entries or clearing cache

[ConPac]

Given that onEviction is "called right before an item is evicted from the cache", it should be called when deleting entries or clearing the cache.

[sindresorhus]

Yes, it should do that. This is a bug.

// @please-rewrite

[vladar]

Explicit delete and eviction are different actions semantically. Not sure if it should be the same callback. That would be a breaking change in our case since on explicit delete we also do an explicit cleanup, so with onEviction firing in this case our cleanup will run twice.