[rust-node-addon] implement privileged reset user password client method for keyserver

Summary:
Depends on D13760

client method that takes the caller's auth metadata (to confirm that they are staff) and the password reset info for a given user

Test Plan: tested in next diff by calling client method from script

Reviewers: will

Reviewed By: will

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13763