Adds a basic framework for a CLI tool for future features. At the time
of this commit, this only includes basic "proof of concept" style
commands, but can and will be extended to more functionality.
Change-Id: I0445384bae7b763d1f1301e427dbb6316faf9ec2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/29880
Commit-Queue: Jason Graffius <jgraff@google.com>
Reviewed-by: Alexei Frolov <frolv@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
