Enhancement: Add gpshrink to support elastic scaling

[lss602726449]

In order to support gpshrink, similar to gpexpand, we first support "alter table shrink table to " and "alter table shrink partition prepare to " to redistribute data on a specific number of segments.

For gpshrink implementation, it is mainly divided into two stages similar to gpexpand:

1. Collect the tables that need to be shrink and write them into gpshrink.status_detail.
2. Perform data redistribution on the tables that need to be shrink, and delete specific segments in gp_segment_configuration.

fix #ISSUE_Number

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