feat: add merge status

[JackTan25]

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Summary

Summary about this PR

1. after merge into operation, we should return the status of update/delete/insert affected rows.
   it should be like:

mysql> create table t1(a int);
mysql> create table t2(a int);
mysql> insert into t1 values(1),(3);
mysql> insert into t2 values(1),(3),(4);
mysql> merge into t1 using t2 on t1.a = t2.a when matched and t2.a = 1 then update * when
matched then delete when not matched then insert *;
+-------------+-------------+-------------+
| insert_rows | update_rows | delete_rows |
+-------------+-------------+-------------+
|           1 |           1 |           1 |
+-------------+-------------+-------------+

• Closes #issue
  feat: merge into returns how many rows update/delete/inserted  #13855

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This change is 

[TCeason]

Modify in 18_0001_udf_priv.result is LGTM.

[github-actions]

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## Summary

Summary about this PR

- Close #issue