tree 5ac0ef559e867bbe7e7e68a85e81c42870f2c3f3
parent 8067e26c3d791439e41b3c674e10b7e0e3d6317c
author michajlo <michajlo@google.com> 1538098353 -0700
committer Copybara-Service <copybara-piper@google.com> 1538098435 -0700

Clean up Package and Package.Builder interface

A lot of stuff was a lot more exposed than it needed to be. This reduces the
number of ways we can create, mutate, and generally interact with packages.
This only grabs the low hanging fruit, there's definitely more.

PiperOrigin-RevId: 214871508