feat: show create table only for base table

[tisonkun]

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?

This closes #3980.

Display:

$ curl -i -XPOST -H 'Content-Type: application/x-www-form-urlencoded' -d 'sql=SHOW CREATE TABLE numbers' http://localhost:4000/v1/sql
HTTP/1.1 400 Bad Request
Content-Length: 121
Connection: keep-alive
Content-Type: application/json
Date: Mon, 03 Jun 2024 15:04:04 GMT
Keep-Alive: timeout=4
Proxy-Connection: keep-alive
X-Greptime-Err-Code: 1001
X-Greptime-Execution-Time: 0

{"code":1001,"error":"Show create table only for base table. greptime.public.numbers is TEMPORARY","execution_time_ms":0}

and

mysql> SHOW CREATE TABLE information_schema.columns;
ERROR 1815 (HY000): Show create table only for base table. greptime.information_schema.columns is TEMPORARY

Checklist

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

[tisonkun]

I'm glad to add some tests but yet to know where to add. Perhaps a new sqlness case?

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.15%. Comparing base (dd06e10) to head (ee1c037).

❗ Current head ee1c037 differs from pull request most recent head cc02217

Please upload reports for the commit cc02217 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4099      +/-   ##
==========================================
- Coverage   85.44%   85.15%   -0.30%     
==========================================
  Files         992      992              
  Lines      173500   173377     -123     
==========================================
- Hits       148245   147637     -608     
- Misses      25255    25740     +485     

[killme2008]

LGTM

[tisonkun]

Sqlness cases added.