Initial commit: add support for CloudberryDB

This is one forked repo from the Greenplum gp-common-go-libs since the
gpbackup utility for CloudberryDB depends on it.

We change just a few lines, you can see the obvious
GetSegmentConfiguration() function changes in this commit.

**Acknowledgment**

Thanks to all the gp-common-go-libs contributors, more details in its
GitHub page: https://github.com/greenplum-db/gp-common-go-libs.

Authored-by: oracle <873988212@qq.com>