Implement issue #73301635: Ability to extract device configuration

am get-config can now return its information as a protobuf,
so that we have a nice machine readable representation of the
configuration available.  This is available through the new
"--proto" option.

Also add a new "--device" option which will include additional
device configuration information in the output.

Defined the protos to contain all of this information.  Updated
Configuration to generate everything it should in the proto.

The output has been changed so that configuration history
will not be returned unless you specify the --days option.

Bug: 73301635
Test: Booted, ran, output

Change-Id: I074b92b45d6b1da1c1a499080db9e006d12b9fea