Need a helper for determining the logical rpc-style response type for http operations

[markcowl]

• Add a new property to HttpOperation and HttpOperationResponse
• Update getHttpOperation to populate these properties
  • if a request/response type has a property decorated with @body (@bodyRoot) use its type as logicalRequest/logicalResponse
  • Otherwise, determine the parameterVisibility for the request and the returnTypeVisibility for the response
  • Use resolved parameter visisbility to call metadata.getEffectiveModelType() for the logicalRequestType
  • Use resolved returnTypeVisibility to call metdata.getEffectiveModelType() for the logicalResponseType
  • provide a separate property or method to return the set of properties that represent the payload (request or response)

export interface HttpOperation {
  /** The request payload */
  logicalRequest: Type;
}
export interface HttpOperationResponse {
  /** The logical RPC-style response */
  logicalResponse: Type;
}

[markcowl]

est: 8

[tjprescott]

@markcowl does the 8 estimate include the time it will take to refactor the OpenAPI (and possibly Autorest?) emitter to use this new helper?