Data race of `should_auto_add_history` in file `Modules/readline.c`

[xxyzz]

Bug report

Bug description:

Read and write of variable should_auto_add_history in file Modules/readline.c is not atomic, thus could be data race in free thread build. For detailed report please see TSAN-0025 from the parent issue #153852.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-154539: Use atomic read and write with should_auto_add_history #154531