CLOUDP-349980: tool/scaffolder: Initial commit for array-based indexers

[igor-karpukhin]

Summary

tool/scaffolder: Initial commit for array-based indexers. Scaffolder can now generate indexers for references in arrays of objects, like: spec.deps.items.groupRef

current limitation: nested arrays are not supported yet

Proof of Work

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
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• Have you signed our CLA?

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