Function enumeration

Example

enum Color {
  Red = 'red',
  Blue = 'blue'
}

const colorDecoder = JsonDecoder.enumeration(Color);
colorDecoder.decode('red'); // Ok<Color>
// The rejected value is rendered with JSON.stringify, so a string keeps its quotes...
colorDecoder.decode('green'); // Err with issues: [{ message: '"green" is not a valid enum value', path: [] }]
// ...while a non-string value (here a number) is rendered without quotes.
colorDecoder.decode(42); // Err with issues: [{ message: '42 is not a valid enum value', path: [] }]
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