Refactor the config subcommand into a single file

Following the vm.py approach, refactored the config subcommand so that
its entire implementation is split between the config.py and
config_builder.py files. This pattern make development easier since it
keeps all changes related to a specific subcommand in the least amount
of files as possible.

Flag: EXEMPT refactor
Test: ./tools/torq_test
Bug: 433995149
Change-Id: I7807f82c0f0e58db4e20d865ec2b5c1794c06455
7 files changed