vm: flip Module#link's signature

The specifier parameter is deemed to be more essential than
referencingModule. Flipping the parameter order allows developers to
write simple linker functions that only take in a specifier.

PR-URL: https://github.com/nodejs/node/pull/18471


Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>