Async Sandbox - Run code output handlers are never awaited

[jakubno]

Note

Await async callbacks for run_code output handlers and add async-capable parsing with tests.

• Python:
  • Async handlers: AsyncSandbox.run_code now accepts OutputHandlerWithAsync for on_stdout, on_stderr, on_result, on_error and awaits them via async_parse_output.
  • Parsing refactor: Add async_parse_output and internal _parse_output that returns an awaitable; update parse_output to delegate.
  • Types: Introduce OutputHandlerWithAsync alongside existing OutputHandler.
• Tests:
  • Add async callback tests for results, stdout, stderr, and error; include a sync-callback case.
• Changeset:
  • Patch release: "Await async callbacks".

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[linear]

ENG-3217 `AsyncSandbox.run_code` output handlers are never awaited

[mishushakov]

minor nits