Writing and Reading Random Access Files

Maybe related to #353

It is already possible to use Tables.partitioner to write record batches to a single Arrow file. However, when I read that file with Arrow.Table I do not know how to access a specific record batch like here: https://arrow.apache.org/docs/java/ipc.html#writing-and-reading-random-access-files

According to the docs, this should be possible but I am not sure if that is not implemented yet or simply not documented.

Start with the Tables.partitioner write path and Arrow.Table reading behavior, then compare them with the Apache Arrow Java random-access-files documentation linked in the issue. Check related issue #353 and determine whether record-batch access is implemented or only undocumented; done means the supported behavior and required user-facing guidance are clear.

Written by the indexing model from the issue text.