fix(codegen): awsQueryCompat error matching and error shape

[kuhe]

This PR adds changes errors from

(error): {
  Type: string
  Code: string
  __type: string
  [other: string]: string
}

to

(error): {
  Type: string
  Code: string
  Error: {
    Type: string
    Code: string
    [other: string]: string
  }
  __type: string
  [other: string]: string
}

for services operating in AWS Query Compatibility mode (SQS only at this time).

Although this is somewhat redundant, it is necessary to make the structure consistent with how errors are deserialized in AWS Query protocol and retain backwards compatibility.

[github-actions]

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