feat: add array operators

[afilp]

More info here: nestjsx#754

[zaro]

@afilp unfortunately tests are failing with this change. I spend some time trying to figure out what causes it, but it's not obvious at all.

I don't have time in the next few days to figure it out, so it will have to wait until I have time...

[afilp]

Sure!

I just copied/pasted the old code from that PR:
nestjsx#754

So, that you can have a start. Most likely that old code would fail somewhere.

[zaro]

@afilp this is merged and released as 5.3.1 .

[afilp]

@afilp Does it work eventually? Without any changes? Thanks!

[zaro]

@afilp I don't understand do you mean?

Install v5.3.1 and check if it's working. I fixed the tests, but I didn't have time to test the two new array operators. The branch is actually meged, but I closed the PR, because it was way more work to merge it trough the PR.

As for the changes, I had to make a trivial change because of small refractor that this PR is doing.