Schema validation: For unrecognized keys, show warnings or throw an error

[nitrocode]

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Describe the Feature

To the untrained eye, this may look good

components:
  terraform:
    eks:
      enabled: true
      availability_zones: [ "us-east-2a" ]

However, atmos will gladly use this config and pass it along to terraform but will omit the vars because the vars key is not used above.

To prevent the above, atmos could look for keys like settings, backend, and vars after components.terraform.xyz. Since enabled doesn't match any of those, it would be nice if atmos threw an error or showed a warning to describe the unrecognized inputs.

Describe Ideal Solution

Warning: unrecognized input `enabled` in `components.terraform.eks` in `stacks/catalog/eks.yaml`. Current location allows for the following keys: `settings`, `backend`, or `vars`.

or

Error: unrecognized input `enabled` in `components.terraform.eks` in `stacks/catalog/eks.yaml`. Current location allows for the following keys: `settings`, `backend`, or `vars`.