Allow a generic set of keys in integrations like atlantis

[nitrocode]

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Describe the Feature

Allow a generic set of keys in integrations like atlantis. This way we don't have to continuously update the interface whenever atlantis maintainers add/rename/delete configuration keys.

Expected Behavior

Allow pass through generic keys from

# atmos.yaml
integrations:
  atlantis:
    path: "atlantis.yaml"
    config_templates:
      default:
        version: 3
        key: value

atmos atlantis generate repo-config \
  --config-template default \
  --output-path=/dev/stdout

Should return

# atlantis.yaml
version: 3
key: value

references

• Created from https://github.com/cloudposse/atmos/pull/189#discussion_r964331455