Explicit lambda arguments shouldn't be called `it`

[petertrr]

Explicit lambda arguments are named it. This is confusing, even though the language allows it. I'll create a separate issue to implement this check as a part of Diktat.

Originally posted by @petertrr in https://github.com/analysis-dev/diktat/issues/1228#issuecomment-1080781871

[orchestr7]

@nulls will cover it, I hope