Add AutoEncryptionSettings#toString

All values hidden

JAVA-4439

Author: jyemin

driver-core/src/main/com/mongodb/AutoEncryptionSettings.java

@@ -359,4 +359,9 @@ private AutoEncryptionSettings(final Builder builder) {
         this.extraOptions = notNull("extraOptions", builder.extraOptions);
         this.bypassAutoEncryption = builder.bypassAutoEncryption;
     }
+
+    @Override
+    public String toString() {
+        return "AutoEncryptionSettings{<hidden>}";
+    }
 }