Add structured version info for readline

Feature or enhancement

readline exposes the version of the readline library only under private names: _READLINE_VERSION (RL_READLINE_VERSION, an int like 0x0803), _READLINE_RUNTIME_VERSION (rl_readline_version, an int) and _READLINE_LIBRARY_VERSION (rl_library_version, a string like '8.3'), added for tests.

Add readline.READLINE_VERSION_INFO for the build-time version and readline.readline_version_info for the runtime version, named tuples with major and minor fields (readline has no third component), and readline.readline_version for the runtime version string. The private names are kept for backward compatibility.

With the libedit backend (readline.backend == 'editline', i.e. the module was built against libedit's readline emulation), these describe the emulated readline API (4.2, 'EditLine wrapper'), not libedit itself, which has no meaningful version API.

Linked PRs

• gh-157486

Commencez par examiner les noms de version privés existants de readline ainsi que le comportement spécifique au backend décrit dans l’issue. Le travail est terminé lorsque les informations publiques de version à la compilation et à l’exécution sont exposées avec les noms et champs demandés, tandis que les noms privés restent disponibles et que les valeurs de libedit décrivent son API émulée.