src: move req_wrap_queue to base class of ReqWrap

Introduce a second base class for `ReqWrap` that does not
depend on a template parameter and move the `req_wrap_queue_`
field to it.

This addresses undefined behaviour that occurs when casting
to `ReqWrap<uv_req_t>` in the `ReqWrap` constructor.

Refs: https://github.com/nodejs/node/issues/26131

PR-URL: https://github.com/nodejs/node/pull/26148


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>