Order list to be the same order as in build, even though it does not
matter in the commands list.

Add missing `deleteCmd` to buildrun command.

There could be the use case that a user will run multiple buildruns
while due to frequent changes during development cycles. It can be
cumbersome to come up with a unused name for the buildrun every time.

Change code to accept either one or no buildrun name. In case none is
provided, come up with a random name for the buildrun.

Reference shipwright-io/build#717

Add `bundle` package that contains convenience code to push a local
source code directory as a bundle image to a container registry.

Add new flags for container image and local directory settings.

Go version to 1.16

github.com/google/go-containerregistry to `v0.6.0`
github.com/schollz/progressbar/v3 to `v3.8.2`
k8s.io/api to `v0.20.6`
k8s.io/apimachinery to `v0.20.6`
k8s.io/cli-runtime to `v0.20.2`
k8s.io/client-go to `v0.20.6`
github.com/shipwright-io/build to `v0.5.2-0.20210830191632-04ff81c93dd5`

Make sure to support IBM Cloud and Google Cloud Kubernetes services and their
respective auth requirements.

Add underscore imports to pull in required init functions.