[CDM perm sync] Introduce a new startSystemDataTransfer API with

callback

This new trigger API accpets a callback which would be executed when the
system data transfer finishes successfully or with error.

The callback hasn't been fully implemented because we need signals from
transport layer when the transfer finishes.

Bug: 237030169

Test: m builds
Change-Id: I7e57d3e53e5f019c8730df10f7ec6c840e446f67