match the constraints of the PutLogEvents API

* [ ] None of the log events in the batch can be older than 14 days or the retention period of the log group.
* [x] The maximum number of log events in a batch is 10,000. - #10
* [ ] A batch of log events in a single request cannot span more than 24 hours. - #15

https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_PutLogEvents.html

Start by locating the Python code that builds and sends PutLogEvents batches, then compare its current behavior with the AWS PutLogEvents API documentation. Implement the unchecked constraints for event age and the 24-hour batch span, and verify that the request batches satisfy those limits; the issue does not name any files or tests.

Written by the indexing model from the issue text.