fix: added redis for collection hierarchy

[romitshah02]

Store collection hierarchy relationship data (leaf nodes, optional nodes, ancestors) in Redis instead of Yugabyte when Redis is enabled, so a companion change in lern-service can read the same keys instead of hitting Yugabyte's hierarchy_relations table directly.

CollectionPublisher.storeRelationshipData now branches on config.redisEnabled: writes SET "${rootId}:${identifier}:${relationshipType}" <json-array-of-node_ids> to a dedicated Redis db index (10, redis.database.hierarchyRelations.id) via a new DataCache wired in CollectionPublishFunction, falling back to the existing Cassandra upsert when Redis is disabled. No behavior change when redis.enabled=false (default).

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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