[rust-node-addon] syncPlatformDetails client code and bindings

Summary: we'll call this function from keyserver.js when the primary keyserver node is able to fetch identity info from the metadata table

Test Plan: tested at end of stack

Reviewers: bartek, will

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13664