Evict fails on keys that are not actually present in cache

Evict internally calls the SDK's `remove` method, which will throw a `DocumentDoesNotExist` if the id is not stored in database.

This can be problematic in certain cases where the `@CacheEvict` annotated method is supposed to create the initial value or triggers eviction of a non-cached value. It could also come up when cached values are naturally removed from Couchbase through TTL, and a later evict call is triggered when updating the canonical value.