There already is an existing requirement to have matching calls of
`napi_async_init()` and `napi_async_destroy()`, so expecting users
of this API to manually hold onto the resource for the duration of
the `napi_async_context`'s lifetime is unnecessary.
Weak callbacks are generally useful for when a corresponding C++
object should be cleaned up when a JS object is gargbage-collected,
but that is not the case here.
PR-URL: https://github.com/nodejs/node/pull/59828
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
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