REPL feature: Re-print prompt when resumed

Feature or enhancement

Proposal:

Currently, the Python REPL does not re-print the prompt after it is resumed after being suspended after the SUSP character is typed on the terminal.
The Python process needs to add a handler for the SIGCONT signal that re-prints the prompt.
Otherwise, a resumed Python REPL process looks broken:

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-155662

从 Python REPL 入口点开始，检查终端挂起和信号的处理方式，重点关注 SIGCONT。通过挂起并恢复交互式 REPL 来复现该问题，然后验证恢复后是否会重新打印提示符。该 issue 链接了 PR gh-155662，因此请在开始前检查这项工作。