Support the expansion of metrics data statistics in RocketMQ-Spring.

[heihaozi]

FEATURE REQUEST

1. Please describe the feature you are requesting.

Now, in rocketmq-spring project, it dosen't support the expansion of metrics data statistics from the client dimension. This feature can enable:

• Provide standard and diverse metrics representation(e.g. percentile, gauge, histogram).
• Standardization of monitoring API and transport server API, and adapt to open-source monitoring components (e.g. Prometheus).
• Integration with open-source visualization solution(e.g. Grafana).

2. Provide any additional detail on your proposed use case for this feature.

So, we can support this feature in rocketmq-spring.

3. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this issue?