feat(AIC-3495): record which public helpers an application calls

[jeffdupont]

Summary

• Each public helper sends one $ld:ai:sdk:usage event per client, with the core package name, version, language, the same helper string the TypeScript SDK sends, and the helper's own package name and version (helperPackageName / helperPackageVersion, the same values the package registers with sdk-info; spec in ai-sdks-monorepo#45). Each handler package's name and version now live in its _version.py, and release-please's extra-files point there. The same anonymous context as $ld:ai:sdk:info is used.
• A call made from inside the SDK does not send another event, so a wrapper reports only itself. SDK code calls non-reporting internal versions (_create_handler, _config, _graph, ...; importable but not in __all__), rather than suppressing reports for the duration of a call. Python also reports client.init_evaluations.
• A helper called before a client exists is held and flushed on init. shutdown() clears the reported set. A thrown track is swallowed and not retried.

Fixes AIC-3495.

Test plan

• Client usage tests: one event per helper, no repeat until shutdown, a call before init is sent once a client exists, a thrown track does not fail the helper, and generation payloads are unchanged
• Each handler helper emits only its own string
• Graph wrappers and native adapters: invoke / stream on the returned object emits only the wrapper's helper, not client.graph.*
• A helper called from a user handler or tool reports the same way under config().invoke and config().stream
• Each handler helper's event carries its own package's PACKAGE_NAME / __version__, including when held until init
• Full suite: 1463 passed, 11 skipped. Ruff and mypy are clean

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