Improve onSubmit parameter types

[dmnd]

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Consider changing onSubmit's arguments to (FormulaOneResult<T>, ExtraSubmitData) , where:

type FormulaOneResult<T> =
  | {
    valid: true,
    value: T
  }
  | {
    valid: false,
    internalValid: boolean, // or clientValid, if we don't want to change the name
    externalValid: boolean,
    invalidValue: T
  };