[Improvement] Support lazily init the grpc client channel

[zuston]

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Search before asking

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

What would you like to be improved?

In current codebase, the grpc client channel will be created once the sending/getting happens. But connection will not be used if the partition data don't exist. So I think the lazily initialization of grpc client channel is meaningful.

How should we improve?

No response

Are you willing to submit PR?

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

[zuston]

WDYT? @jerqi @summaryzb

[summaryzb]

please assign this to me