Unique

by Pineapple @Pineapple0919

takes an Array T, returns the Array T without repeated values. ```ts type Res = Unique<[1, 1, 2, 2, 3, 3]>; // expected to be [1, 2, 3] type Res1 = Unique<[1, 2, 3, 4, 4, 5, 6, 7]>; // expected to be [1, 2, 3, 4, 5, 6, 7] type Res2 = Unique<[1, "a", 2, "b", 2, "a"]>; // expected to be [1, "a", 2, "b"] type Res3 = Unique<[string, number, 1, "a", 1, string, 2, "b", 2, number]>; // expected to be [string, number, 1, "a", 2, "b"] type Res4 = Unique<[unknown, unknown, any, any, never, never]>; // expected to be [unknown, any, never] ```