77. 数组去重

实现一个通用的工具类型 Unique<T> ，其中 T 必须是一个数组，返回去重后的数组类型。

例如：

type Res1 = Unique<[1, 1, 2, 2, 3, 3]>; // expected to be [1, 2, 3]
type Res2 = Unique<[1, 2, 3, 4, 4, 5, 6, 7]>; // expected to be [1, 2, 3, 4, 5, 6, 7]
type Res3 = Unique<[1, "a", 2, "b", 2, "a"]>; // expected to be [1, "a", 2, "b"]
type Res4 = Unique<[string, number, 1, "a", 1, string, 2, "b", 2, number]>; // expected to be [string, number, 1, "a", 2, "b"]
type Res5 = Unique<[unknown, unknown, any, any, never, never]>; // expected to be [unknown, any, never]