Batch publish - Nats-Expected-Last-Sequence and Nats-Rollup header support #6975
Description
Observed behavior
Headers like Nats-Expected-Last-Sequence and Nats-Rollup should be properly supported. This currently doesn't work because only replicas check these headers. The leader should check, and be able to fail the batch on a mismatch.
Expected behavior
Support these headers.
Server and client version
main
Host environment
No response
Steps to reproduce
No response