feat: show create database

[fengjiachun]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

As the title said:

mysql> CREATE DATABASE IF NOT EXISTS mydb
    -> WITH(
    ->   ttl = '2days 2h 2m'
    -> );
Query OK, 1 row affected (0.00 sec)

mysql> SHOW CREATE DATABASE mydb;
+----------+------------------------------------------------------------------+
| Database | Create Database                                                  |
+----------+------------------------------------------------------------------+
| mydb     | CREATE DATABASE IF NOT EXISTS mydb
WITH(
  ttl = '2days 2h 2m'
) |
+----------+------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 1.83486% with 107 lines in your changes missing coverage. Please review.

Project coverage is 84.59%. Comparing base (5e4bac2) to head (c821c31).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4642      +/-   ##
==========================================
- Coverage   84.90%   84.59%   -0.32%     
==========================================
  Files        1105     1105              
  Lines      198907   199013     +106     
==========================================
- Hits       168884   168357     -527     
- Misses      30023    30656     +633     

[WenyXu]

Rest LGTM