Add a tool to understand public GKE imagemap

[krzyzacy]

aka understand https://www.gstatic.com/gke-image-maps/gke-to-cos.json from a nodepool config

[krzyzacy]

/assign @kasey-l

[google-oss-prow]

@krzyzacy: GitHub didn't allow me to assign the following users: kasey-l.

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In response to this:

/assign @kasey-l

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[kasey-l]

/assign @kasey-l

[krzyzacy]

/woof

[google-oss-prow]

@krzyzacy:

Details

In response to this:

/woof

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