feature: new rule use-fmt-print (#1389)

print and println built-in functions are not recommended for use-cases other than language boostraping and are not guaranteed to stay in the language.

This commit adds a new rule, use-fmt-print, that spots uses of print and println, and recommends using their fmt equivalents.

testdata/use_fmt_print_with_redefinition.go

@@ -0,0 +1,24 @@
+package fixtures
+
+import (
+	"fmt"
+)
+
+func print()   {}
+func println() {}
+
+type useFmtPrintT struct{}
+
+func (useFmtPrintT) print(s string)   {}
+func (useFmtPrintT) println(s string) {}
+
+func useFmtPrint() {
+	fmt.Println("just testing")
+	fmt.Print("just testing")
+	t := useFmtPrintT{}
+	t.print("just testing")
+	t.println("just testing")
+
+	println("just testing")
+	print("just testing")
+}