Allow NestedFields to support Lists

[mbaijal]

Is your feature request related to a problem?
Some CRD fields contain a list of nested objects which should also be allowed to be referred/marked for various purposes. Refer to Code-Generator PR#47.

An example of this use case would be the DescribeScalableTargets API call.
At the moment, this API does not return any status field in the response and hence I would like to be able to add the CreationTime as a metadata field using something like -

resources:
  ScalableTarget:
    fields:
      ResourceID:
        is_read_only: true
        is_arn: true
        from:
          operation: DescribeScalableTargets
          path: ScalableTargets..ResourceId

This currently fails with the following error, but should successfully add the desired sub-field to the object status:

panic: unknown additional Status field with Op: DescribeScalableTargets and Path: ScalableTargets..CreationTime

Describe the solution you'd like
Support for parsing CRD subfields that are lists.

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Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[a-hilaly]

/remove-lifecycle stale

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Rotten issues close after an additional 30d of inactivity.
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/lifecycle rotten

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/close

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@ack-bot: Closing this issue.

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/close

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