将两个类型合并成一个类型，第二个类型的键会覆盖第一个类型的键。
例如
type foo = {
name: string;
age: string;
}
type coo = {
age: number;
sex: string
}
type Result = Merge<foo,coo>; // expected to be {name: string, age: number, sex: string}
import type { Equal, Expect } from '@type-challenges/utils'
type Foo = {
a: number
b: string
}
type Bar = {
b: number
c: boolean
}
type cases = [
Expect<Equal<Merge<Foo, Bar>, {
a: number
b: number
c: boolean
}>>,
]