chore: override write BotBuilderPropertiesConfiguration#toString

Author: damingerdai

botbuilder-spring-boot-autoconfig/src/main/java/io/github/powerbotkit/autoconfigure/BotBuilderPropertiesConfiguration.java

@@ -4,6 +4,7 @@
 
 import java.util.Objects;
 import java.util.Properties;
+import java.util.StringJoiner;
 
 public class BotBuilderPropertiesConfiguration implements Configuration {
 
@@ -33,4 +34,11 @@ public BotBuilderPropertiesConfiguration(BotBuilderProperties botBuilderProperti
         this.properties.setProperty(MICROSOFTAPPID, Objects.isNull(botBuilderProperties.getMicrosoftAppId()) ? "" : botBuilderProperties.getMicrosoftAppId());
         this.properties.setProperty(MICROSOFTAPPPASSWORD, Objects.isNull(botBuilderProperties.getMicrosoftAppPassword()) ? "" : botBuilderProperties.getMicrosoftAppPassword());
     }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", BotBuilderPropertiesConfiguration.class.getSimpleName() + "[", "]")
+                .add("properties=" + properties)
+                .toString();
+    }
 }