Constant mz_persist_client::batch::BLOB_TARGET_SIZE

pub(crate) const BLOB_TARGET_SIZE: Config<usize>;

A target maximum size of blob payloads in bytes. If a logical “batch” is bigger than this, it will be broken up into smaller, independent pieces. This is best-effort, not a guarantee (though as of 2022-06-09, we happen to always respect it). This target size doesn’t apply for an individual update that exceeds it in size, but that scenario is almost certainly a mis-use of the system.