cleanup: minor fixes to ldap exported functions and test

The buildSearchFilter function doesn't need to be exported, and
can use strings.Builder. Add a unit test to make sure this didn't
change any logic.

This will also use the debuglogger to enable debugging.

debuglogger/logger.go

@@ -115,6 +115,28 @@ func Infof(format string, v ...any) {
 	fmt.Printf(string(green)+debugPrefix+format+reset+"\n", v...)
 }
 
+var debugIAMEnabled atomic.Bool
+
+// SetIAMDebugEnabled sets the IAM debug mode
+func SetIAMDebugEnabled() {
+	debugIAMEnabled.Store(true)
+}
+
+// IsDebugEnabled returns true if debugging enabled
+func IsIAMDebugEnabled() bool {
+	return debugEnabled.Load()
+}
+
+// IAMLogf is the same as 'fmt.Printf' with debug prefix,
+// a color added and '\n' at the end
+func IAMLogf(format string, v ...any) {
+	if !debugIAMEnabled.Load() {
+		return
+	}
+	debugPrefix := "[DEBUG]: "
+	fmt.Printf(string(yellow)+debugPrefix+format+reset+"\n", v...)
+}
+
 // PrintInsideHorizontalBorders prints the text inside horizontal
 // border and title in the center of upper border
 func PrintInsideHorizontalBorders(color Color, title, text string, width int) {