1. Задача: Реализовать conformance протоколу Comparable для опциональных типов и проверить сравнение объектов Foo
// Conforming to the Comparable Protocol
//
// Types with Comparable conformance implement the less-than operator (<) and
// the equal-to operator (==). These two operations impose a strict total order
// on the values of a type, in which exactly one of the following must be true
// for any two values a and b:
//
// 1) a == b
// 2) a < b
// 3) b < a
//
// In addition, the following conditions must hold:
//
// 1) a < a…