feat(dynamodb): add journal event persistence

[bercianor]

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[Copilot]

Pull request overview

Adds a DynamoDB-backed “journal events” persistence path (behind Features.JOURNAL_EVENTS) so audit storage can retain only current state while persisting the full state-transition history as ordered journal events.

Changes:

• Introduces DynamoDB journal-event table model + mapper utilities (JournalEventEntity, field constants, mapper).
• Implements DynamoDBJournalEventStore and wires journal-aware, atomic (audit + journal) writes into DynamoDBAuditPersistence/DynamoDBAuditStore.
• Adds/updates integration and contract tests (auditstore, importer, and end-to-end feature flag coverage).

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
utils/dynamodb-util/src/main/java/io/flamingock/internal/util/dynamodb/entities/journal/JournalEventFieldConstants.java	Defines attribute/index names for the journal events table.
utils/dynamodb-util/src/main/java/io/flamingock/internal/util/dynamodb/entities/journal/JournalEventEntity.java	DynamoDB Enhanced Client bean for journal event items and GSIs.
utils/dynamodb-util/src/main/java/io/flamingock/internal/util/dynamodb/entities/journal/DynamoDBJournalEventMapper.java	Maps JournalEvent<AuditEntry> ↔ DynamoDB entity using JSON payload.
utils/dynamodb-util/src/main/java/io/flamingock/internal/util/dynamodb/entities/AuditEntryEntity.java	Makes metadata / errorTrace string getters null-safe.
legacy/mongock-importer-dynamodb/src/test/java/io/flamingock/importer/mongock/dynamodb/DynamoDBImporterTest.java	Ensures feature flag cleanup between tests.
legacy/mongock-importer-dynamodb/src/test/java/io/flamingock/importer/mongock/dynamodb/DynamoDBImporterJournalTest.java	Verifies importer behavior when journaling is enabled (legacy stream + payload correctness).
core/target-systems/flamingock-dynamodb-externalsystem-api/src/main/java/io/flamingock/externalsystem/dynamodb/api/DynamoDBExternalSystem.java	Aligns DynamoDB external system contract with transactional external systems.
core/target-systems/flamingock-dynamodb-externalsystem-api/build.gradle.kts	Exposes core-commons API to support the transactional external system contract.
community/flamingock-dynamodb-auditstore/src/test/java/io/flamingock/store/dynamodb/internal/DynamoDBJournalEventStoreTest.java	Unit/integration coverage for journal store initialization, append constraints, querying, and acknowledgement behavior.
community/flamingock-dynamodb-auditstore/src/test/java/io/flamingock/store/dynamodb/internal/DynamoDBAuditPersistenceJournalTest.java	Verifies atomic audit+journal writes and sequence behavior at a transaction boundary.
community/flamingock-dynamodb-auditstore/src/test/java/io/flamingock/store/dynamodb/DynamoDBJournalFeatureFlagE2ETest.java	End-to-end feature-flag behavior through a full runner execution.
community/flamingock-dynamodb-auditstore/src/test/java/io/flamingock/store/dynamodb/DynamoDBExternalSystemContractTest.java	Ensures DynamoDB external systems implement the transactional contract.
community/flamingock-dynamodb-auditstore/src/test/java/io/flamingock/store/dynamodb/DynamoDBAuditStoreJournalTest.java	Verifies per-stage journaling streams and repository-name validation.
community/flamingock-dynamodb-auditstore/src/main/java/io/flamingock/store/dynamodb/internal/DynamoDBJournalEventStore.java	Implements the DynamoDB journal event store (table creation, reads, acknowledgements).
community/flamingock-dynamodb-auditstore/src/main/java/io/flamingock/store/dynamodb/internal/DynamoDBAuditPersistence.java	Adds journal-aware write path that stages journal+audit writes in the same transaction.
community/flamingock-dynamodb-auditstore/src/main/java/io/flamingock/store/dynamodb/internal/DynamoDBAuditor.java	Adds transactional staging method for “current state” audit writes.
community/flamingock-dynamodb-auditstore/src/main/java/io/flamingock/store/dynamodb/DynamoDBAuditStore.java	Wires journal store + sequencers into persistence creation and adds journal repository naming/validation.

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[dieppa]

Good contribution. Some comments

Make sure we test the DB constrains and conditions: uniqueness on (streamId, sequence) and eventId. That it returns only the unacknowledged events, etc.