Fixes: #9695
Issue link: https://github.com/spring-projects/spring-integration/issues/9695
The `txSize` in the `SimpleMessageListenerContainer` has been replaced with more reasonable `batchSize`.
Spring Integration XML support for AMQP module has missed to fix this change: we didn't have a respective test.
* Deprecate `tx-size` (will be removed in `6.5`) XML attribute for the `<amqp:inbound-channel-adapter>`
and introduce `batch-size`
* Cover with the tests
* Fix docs from `tx-size` to `batch-size`
(cherry picked from commit 2cf83b5311)