feat: show create postgresql foreign table

[sunng87]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Fixes #5109

What's changed and what's your intention?

This patch adds a new sql statement SHOW CREATE TABLE <table> FOR postgres_foreign_table that returns sql statement for creating postgres foreign table for fdw.

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 30.83333% with 83 lines in your changes missing coverage. Please review.

Project coverage is 83.77%. Comparing base (3133f3f) to head (4ebfd5c).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5143      +/-   ##
==========================================
- Coverage   84.05%   83.77%   -0.29%     
==========================================
  Files        1167     1169       +2     
  Lines      217331   217855     +524     
==========================================
- Hits       182682   182509     -173     
- Misses      34649    35346     +697