Async send mode, the default send executor add abort policy

[lwclover]

Async send mode, the default send executor add abort policy ThreadPoolExecutor.CallerRunsPolicy.

Due to the large number of messages in the production asynchronous sending mode, the block queue capacity was full and subsequent sending failed.

The CallerRunsPolicy is used to limit traffic.

[github-actions]

This issue is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs.

[github-actions]

This issue was closed because it has been inactive for 3 days since being marked as stale.