[Improvement] Support lazily init the grpc client channel

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

### Search before asking

- [X] I have searched in the [issues](https://github.com/apache/incubator-uniffle/issues?q=is%3Aissue) 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!