[Feature] Add SubscriptionHandler admin endpoint

[Pil0tXia]

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Feature Request

Add SubscriptionHandler class at org.apache.eventmesh.runtime.admin.handler.v2 package.

Provide client information for the current Runtime instance to EventMesh Dashboard. including:

• Information such as ip address, consumerGroup, etc. of the clients (specifically business applications using the SDK) and connectors on the source and sink side.
• Information about the topic that the Runtime is responsible for, etc.

You can refer to the infos reported to the registry at org.apache.eventmesh.meta.nacos.service.NacosMetaService#updateMetaData.

You may need to extend org.apache.eventmesh.runtime.core.protocol.producer.ProducerManager and record infos of source side.

Related issue (outdated): #4400

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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