[Outfile] Support exporting query result to local disk

[morningman]

Proposed changes

User can export query result to local disk like:

select * from tbl into outfile ("file:///disk1/result_");

And modify the return result to show the details of export:

mysql> select * from tbl1 limit 10 into outfile "file:///home/work/path/result_";
+------------+-----------+----------+--------------+
| FileNumber | TotalRows | FileSize | URL          |
+------------+-----------+----------+--------------+
|          1 |         2 |        8 | 192.168.1.10 |
+------------+-----------+----------+--------------+

Support create a mark file after export successfully finished.

Types of changes

• New feature (non-breaking change which adds functionality)
• Code refactor (Modify the code structure, format the code, etc...)

Checklist

• I have created an issue on (Fix [Outfile] Support export query result to local disk #5490) and described the bug/feature there in detail

[yangzhg]

LGTM

[yangzhg]

Lgtm