Add some metrics so that they can be monitored on aliyun vvp

Some metrics are not exist in this project，and some metrics are incompatible with existing specification，and I want to modify the code so that these metrics more compliant.
This is my PR：https://github.com/apache/rocketmq-flink/pull/84

Start by reviewing the pull request linked in the issue, then inspect the existing metrics and the specification it references. Confirm which metrics are missing or incompatible for Aliyun VVP and use the PR discussion to determine the intended scope. Done means the required metrics comply with the existing specification and can be monitored on Aliyun VVP.

Written by the indexing model from the issue text.