Add support for transforming a module

Adds support for transforming a bpModule using a bpTransformer
instance. Rewrites the deepCopy code as a transformer.

This is preparation for allowing the update process to perform
per property transformations when transforming an unversioned
prebuilt module to a versioned prebuilt module for use by a
versioned snapshot.

Bug: 142940300
Test: m nothing
Change-Id: I0f438509df23bbb8a5862541b6fbfb1d5fbc06f6