Replace fmt.Println/Printf with t.Log/Logf

[alexandear]

I propose adding a new option fmt-print that detects fmt.Println/fmt.Printf calls in tests.

The check should suggest replacing fmt.Println with t/b.Log, fmt.Printf wtih t/b.Logf.

Real examples

github.com/99designs/gqlgen

In the TestApolloTracing fmt.Printf could be replaced with t.Logf. See 99designs/gqlgen#3099

github.com/hypermodeinc/badger

In the TestExistsMore fmt.Println could by replaced with t.Log.