Allow for specifying batch size in batch APIs

[lukaseder]

Similar to the loader API, which allows for specifying bulk / batch / commit sizes, such configurations might certainly make sense on the batch API as well, at least the batch size.

More specification might follow.

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See also: #2028 (comment)

[zeagord]

Following. It will be useful to specify the batch sizes.

[lukaseder]

Thank you very much for your feedback, @zeagord. In order to better understand what users might need in this area, would you mind explaining your use case a bit? In what scenario would you like to be able to specify the batch sizes?

[zeagord]

@lukaseder We were hoping to use jooq along with spring batch and for rewrapping the sensitive data during key rotation the key . we have some spring batch jobs processing at ~1000 to 10000 chunks and approximately and it has to be updated to the datastore. it would be nice to specify the batch sizes in them.