Add DurableStateStore TCK to persistence-tck module

[pjfanning]

Summary

See #2831

Adds a standardised Technology Compatibility Kit (TCK) for DurableStateStore implementations to the persistence-tck module. This allows plugin authors (such as those working on pekko-persistence-jdbc, pekko-persistence-r2dbc, and pekko-persistence-cassandra) to include a consistent test suite in their projects.

Changes

persistence-tck/src/main/scala/org/apache/pekko/persistence/CapabilityFlags.scala

• Added DurableStateStoreCapabilityFlags trait with a supportsDeleteWithRevisionCheck capability flag, following the same pattern as JournalCapabilityFlags and SnapshotStoreCapabilityFlags.

persistence-tck/src/main/scala/org/apache/pekko/persistence/state/DurableStateStoreSpec.scala (new)

Scala TCK spec that plugin authors extend. Tests:

• getObject on a non-existing persistence ID returns None
• upsertObject followed by getObject returns the stored value and correct revision
• Upserting twice updates the state (last write wins)
• deleteObject(persistenceId, revision) makes the state unavailable
• Different persistence IDs are independent of one another
• Optional (supportsDeleteWithRevisionCheck): deleting with a mismatched revision fails and leaves the original state intact

persistence-tck/src/main/scala/org/apache/pekko/persistence/japi/state/JavaDurableStateStoreSpec.scala (new)

Java/JUnit-consumable wrapper around DurableStateStoreSpec, following the same pattern as JavaJournalSpec and JavaSnapshotStoreSpec.

persistence-testkit/src/test/scala/…/PersistenceTestKitDurableStateStoreTCKSpec.scala (new)

Reference test implementation that exercises the new TCK using the existing in-memory PersistenceTestKitDurableStateStore, verifying the TCK itself works correctly.

Usage by plugin authors

class MyPluginDurableStateStoreSpec
    extends DurableStateStoreSpec(
      ConfigFactory.parseString("""
        pekko.persistence.state.plugin = "my.plugin.durable-state"
        my.plugin.durable-state.class = "com.example.MyDurableStateStoreProvider"
      """)
    ) {
  override protected def supportsDeleteWithRevisionCheck: CapabilityFlag = CapabilityFlag.on()
}

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