Turn on print_stdout clippy lint

[dsherret]

Given that swc has a lot more contributors, I think it would be useful to slowly start turning on some clippy rules. For example, the "print_stdout" rule would be useful on most crates:

https://rust-lang.github.io/rust-clippy/master/#print_stdout

This would prevent #3244

Edit: Actualy this lint rule is annoying to use until this is fixed rust-lang/rust-clippy#6610

[kdy1]

I think using clippy is a good thing to do. Recent nightly typically has all components so my reason for not using clippy is not valid anymore.
I'll configure it soon.

[kdy1]

I tried it, but it prodecd too much warnings so it will take lots of time.

[kdy1]

Oh, I'll see if --fix works