[improve][pip] PIP-347: add role field in consumer's stat (apache#22564)

pip/pip-347.md

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+# PIP-347: add role field in consumer's stat
+
+# Background knowledge
+
+During the operation and maintenance process, there are many users asking administrator for help to find out the consumers of a topic and notify them about the business change.
+Administrators can call `bin/pulsar-admin topics partitioned-stats` to find out the `ip:port` of the consumers, but no role info. So administrators need to take a lot of time to
+communicate with users to find out the owner based on the `ip:port`. It's a troublesome work and low efficiency, or even can't find out the owner.
+
+# Motivation
+
+This pip can help to solve such kind of problem. By adding a field `appId` in the consumer's stat.
+For cluster with JWT-based authentication, the administrator can find out the owner of the consumer directly. 
+It can save a lot of time and improve the efficiency of the operation and maintenance process.
+
+# Goals
+
+- help administrator to find out the owner of the consumer for cluster with JWT-based authentication.
+
+# Detailed Design
+
+## Design & Implementation Details
+- Add a field `appId` in the consumer's stat, which can show the owner of this consumer for JWT-based authentication users.
+
+# Backward & Forward Compatibility
+
+Fully compatible.
+
+# General Notes
+
+# Links
+
+<!--
+Updated afterwards
+-->
+* Mailing List discussion thread: https://lists.apache.org/thread/p9y9r8pb7ygk8f0jd121c1121phvzd09
+* Mailing List voting thread: