Ocean: Initial setup

[Jouzo]

Summary

• Initial Ocean archive setup.
• Adds placeholder FFI calls for indexing/invalidating block
• Adds RocksDB columns families, models and repository for data access

Descritipion

• storage directory holds ain-db Column, TypedColumn and ColumName implementations.
• model directory holds indexed model values and keys.
• repository directory holds implementation of RepositoryOps for bridging column family to the right model.
• Indexer directory holds placeholder for indexing/invalidating block which will be implemented in subsequent PR.

Dependencies

• Depends on https://github.com/DeFiCh/ain/pull/2852 and https://github.com/DeFiCh/ain/pull/2853
• Epic PR ref : https://github.com/DeFiCh/ain/pull/2724