[Enhancement] extends show data skew

[dataroaring]

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• I had searched in the issues and found no similar issues.

Description

SHOW DATA SKEW returns data distribution info. Now at least one partition must be specified, we need extend the command to show all partitions for a table, that is the command works for a table without a partition specified.

https://doris.apache.org/docs/dev/sql-manual/sql-reference/Show-Statements/SHOW-DATA-SKEW?_highlight=skew

Solution

return contents like below.
PARTITION_NAME and original skew info.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[xiedeyantu]

I will try