Introduce Autopilot compatibility checks

[danielmarzini]

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Description

Introduce additional set of rules for checking if a given GKE Standard cluster, and workloads running on it, are compatible with GKE Autopilot mode.

• Introduce ./gke-policy check compatibility CLI command that will enable required inputs and process REGO rules from gke.compatibility package
• Add compatibility rules

References

• Compare GKE Autopilot and Standard
• GKE Autopilot security capabilities
• Resource requests in Autopilot

[mikouaj]

References:

• Compare GKE Autopilot and Standard
• GKE Autopilot security capabilities
• Resource requests in Autopilot

[mikouaj]

This feature most likely duplicates the already existing API capabilities and existing gcloud command:
gcloud container clusters check-autopilot-compatibility

We need to verify what checks are supported by the API provides however.