Preview should show provider output shape

[lblackstone]

Hello!

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Issue details

ESC providers are schematized, so it should be possible to show expected outputs with [unknown] values during preview. The current behavior is to show the entire output as [unknown].

For example, the aws-login provider has preview output like this:

{
  "aws": {
    "creds": "[unknown]"
  }
}

It would be more useful if it looked like this instead:

{
  "aws": {
    "creds": {
      "accessKeyId": "[unknown]",
      "secretAccessKey": "[unknown]",
      "sessionToken": "[unknown]"
    }
  }
}

Affected area/feature