Show create database statement

[junnplus]

Summary

After #3542, we should support SHOW CREATE DATABSE statement to show engine options.

mysql> create database datafuselabs engine=github(token='xxxxx');
mysql> show create database  datafuselabs;
CREATE DATABASE `datafuselabs` ENGINE=GITHUB(token='xxxxx');

https://dev.mysql.com/doc/refman/8.0/en/show-create-database.html

[sundy-li]

Ok, but let's apply the mask to the secret token or other entry options.

[junnplus]

Ok, but let's apply the mask to the secret token or other entry options.

IMHO, this shouldn't be needed, we should control by permissions. The same goes for clickhouse.

[junnplus]

/assignme