logback-appender-1.0's captureKeyValuePairAttributes implementation lost value type

[qixiaogang]

Describe the bug

Current logback-appender-1.0's captureKeyValuePairAttributes implementation lost value type when converting KeyValuePair to attributes

  private static void captureKeyValuePairAttributes(
      AttributesBuilder attributes, ILoggingEvent loggingEvent) {
    List<KeyValuePair> keyValuePairs = loggingEvent.getKeyValuePairs();
    if (keyValuePairs != null) {
      for (KeyValuePair keyValuePair : keyValuePairs) {
        if (keyValuePair.value != null) {
          attributes.put(getAttributeKey(keyValuePair.key), keyValuePair.value.toString());
        }
      }
    }
  }

Steps to reproduce

when logging as below using slf4j

        logger.atInfo().setMessage("This is a test for keyValue")
                .addKeyValue("string", "stringValue")
                .addKeyValue("double", 10.1)
                .addKeyValue("long", 10)
                .addKeyValue("boolean", true)
                .log();

and then configure logback appender 1.0 with captureKeyValuePairAttributes=true

Expected behavior

Expect attributes of key boolean, double, long, and string as below
{boolean=true, double=10.1, long=10, string="stringValue", ...}

Actual behavior

while attributes of key boolean, double, long, and string as below
{boolean="true", double="10.1", long="10", string="stringValue", ...}

Javaagent or library instrumentation version

2ee4ee1

Environment

JDK:
OS:

Additional context

No response

[qixiaogang]

@laurit @steverao thank you.