gh-122622: Add sys._preexec hook for REPL #144724
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See issue mentioned for background info: #122622
Adding preexec hook will allow VS Code to enable shell integration for users on Windows! VS Code setting:
python.terminal.shellIntegration.enabledThis also means we can also provide lsp completions in the REPL: https://code.visualstudio.com/updates/v1_101#_language-server-based-terminal-suggest
Also planning to enable PY_REPL back since #126131 is resolved.
Thank you
/cc @picnixz @Tyriar @brettcannon