[FEATURE] Speed up the registering on reassign

[zuston]

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• [x] I have searched in the issues and found no similar issues.

Describe the feature

The reassign rpc costs too much time when registering.

Motivation

No response

Describe the solution

No response

Additional context

No response

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

[zuston]

In the case of partition reassign, this will block the rpc response. It should be acted with thread pool.