napi add async cleanup hook

Stability: 1 - Experimental

NAPI_EXTERN napi_status napi_add_async_cleanup_hook(
    napi_env env,
    napi_async_cleanup_hook hook,
    void* arg,
    napi_async_cleanup_hook_handle* remove_handle);

• [in] env: The environment that the API is invoked under.
• [in] hook: The function pointer to call at environment teardown.
• [in] arg: The pointer to pass to hook when it gets called.
• [out] remove_handle: Optional handle that refers to the asynchronous cleanup hook.

Registers hook, which is a function of type [napi_async_cleanup_hook][], as a function to be run with the remove_handle and arg parameters once the current Node.js environment exits.

Unlike [napi_add_env_cleanup_hook][], the hook is allowed to be asynchronous.

Otherwise, behavior generally matches that of [napi_add_env_cleanup_hook][].

If remove_handle is not NULL, an opaque value will be stored in it that must later be passed to [napi_remove_async_cleanup_hook][], regardless of whether the hook has already been invoked. Typically, that happens when the resource for which this hook was added is being torn down anyway.