Changes to Texas Electricity Plan Finder

added the new tool_error enum value to the error response property for the response status 400

added the new tool_error enum value to the error response property for the response status 500

added the new optional request property exportKwh

added the non-success response with the status 422

added the optional property criteria/exportKwh to the response with the 200 status

added the optional property error_code to the response with the 400 status

added the optional property error_code to the response with the 500 status

added the optional property plans/items/exportCreditEstimate to the response with the 200 status

added the optional property plans/items/exportRate to the response with the 200 status

added the optional property plans/items/exportRateType to the response with the 200 status