Ability to save entities without triggering events

[knstvk]

Adds two SaveContext hints that let callers suppress lifecycle events when saving via DataManager, for use cases like bulk import and technical/system updates that shouldn't trigger business logic.

New hints (io.jmix.data.PersistenceHints):

• SKIP_ENTITY_SAVING_EVENT — suppresses EntitySavingEvent
• SKIP_ENTITY_CHANGED_EVENT — suppresses EntityChangedEvent

The two are independent; default behavior (hints absent) is unchanged.

dataManager.save(new SaveContext()
        .saving(entity)
        .setHint(PersistenceHints.SKIP_ENTITY_CHANGED_EVENT, true)
        .setHint(PersistenceHints.SKIP_ENTITY_SAVING_EVENT, true));

Implementation: JpaDataStore.saveAll() skips EntitySavingEvent publishing; beforeSaveTransactionCommit() skips EntityChangedEvent publishing while still running change collection and entity detachment.

Caveats (documented on the constants): suppressing EntitySavingEvent also skips multitenancy tenant-id assignment; suppressing EntityChangedEvent also skips full-text search re-indexing and security cache invalidation. Audit fields (JPA descriptor level) and the audit entity log (JpaLifecycleListener) are not affected.