[DISCUSS] Add open table format support.

Currently popular open table formats such as iceberg, deltalake all have rust implementation, should we consider adding native support for them in ballista so that users could access these otfs out of box?

Start by reading the issue discussion and reviewing how Ballista currently handles table formats. Determine whether native Iceberg and Delta Lake support is in scope and what integration points would be affected. Done would be a maintainer-approved design or a concrete follow-up implementation issue.

Written by the indexing model from the issue text.