[Feature] Support for Bottlerocket OS

[mjudeikis]

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We would like to be able to use same Opensource OS in multicloud configuration. Previously we used CoreOS for this.
Currently one of the alternatives is bottlerocket-os. Would be great if there would be ability to use public images based on BottleRocketOS in our AKS clusters

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Be able to use Open and transparent OS in my AKS clusters.

Previously AKS images were public and easier to access. Now, despite the fact they are build using public project - its not possible to inspect them easier. This makes it bit more proprietary when we would like it to see.

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We can't. AKS-Engine is dead :/

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Additional info:
bottlerocket-os/bottlerocket#1114
Azure/AgentBaker#3340

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