fix: ValidateNested support multi-dimensional arrays

[jBouyoud]

@NoNameProvided This PR aims to fix #538

[jBouyoud]

@vlapo

[vlapo]

Looks good for me. Could you please add some note to docs about multidimensional arrays?

[satanTime]

does it work with tuples too? myTupleClasses: [MyClass1, MyClass2];

[vlapo]

This PR is about multidimensional arrays. myTupleClasses: [MyClass1, MyClass2]; is basically simple array (we already support simple arrays). But we validate only items of array. So for example this will pass:

class Tuple1 {
  @IsNumber()
  num: number;
}

class Tuple2 {
  @IsString()
  name: string;
}

class Test {

  @ValidateNested()
  tuples: [Tuple1, Tuple2];

}

const t = new Test();
t.tuples = [new Tuple1(), new Tuple1() as any];
t.tuples[0].num = 2 as any;
(t.tuples[1] as any).num = 2 as any;

console.log(validateSync(t));

[jBouyoud]

I've added a very simple example about multi dimensional array.
Let me know if that not enough

[vlapo]

This is not full support of multi-dimensional arrays but at least @ValidateNested works now.
So I will not close #538 and track multi-dimensional support there.
Thank you!

[github-actions]

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