Add support for homebrew

[remyleone]

As a mac user, I would like to be able to install kfctl as a command-line tool using homebrew.

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Label	Probability
kind/feature	1.00
area/kfctl	0.98

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[moficodes]

@animeshsingh I can work on getting a brew tap going.

Will it be possible to get a homebrew-tap repository under kubeflow?

[animeshsingh]

@jlewi thoughts?

[jlewi]

I'm generally against creating more repositories under Kubeflow as it creates a burden on a small number of folks (see kubeflow/testing#737)

There were also previous attempts to create homebrew repos https://github.com/kubeflow/homebrew-core https://github.com/kubeflow/homebrew-cask

Is there a reason this needs to be created in the Kubeflow org?

If this necessary can the forthcoming deployment WG leads create a repo somewhere else so they can take on the burden of administering it? Maybe just create the GitHub org MLDeployments?

/cc @kubeflow/google-admins

[naveensrinivasan]

I didn't see this issue before creating this one https://github.com/kubeflow/kfctl/issues/420