[I] Support `SHOW` command [arrow-adbc]

[via GitHub]

mcrumiller opened a new issue, #2093:
URL: https://github.com/apache/arrow-adbc/issues/2093

   ### What feature or improvement would you like to see?
   
   In postgres, the 
[`show`](https://www.postgresql.org/docs/current/sql-show.html) command returns 
server/session configuration attributes:
   
   ```sql
   SHOW all
   ```
   
![image](https://github.com/user-attachments/assets/de19b4a7-3f8c-4723-93fc-eabfd740fd2a)
   
   The `show` command doesn't appear to be recognized by abdc:
   
   ```pycon
   >>> cur.execute("show all")    
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File 
"C:\Projects\cqn-bur\.venv_cqn\Lib\site-packages\adbc_driver_manager\dbapi.py", 
line 698, in execute
       handle, self._rowcount = _blocking_call(
                                ^^^^^^^^^^^^^^^
     File "adbc_driver_manager\\_lib.pyx", line 1590, in 
adbc_driver_manager._lib._blocking_call
     File "adbc_driver_manager\\_lib.pyx", line 1213, in 
adbc_driver_manager._lib.AdbcStatement.execute_query
     File "adbc_driver_manager\\_lib.pyx", line 260, in 
adbc_driver_manager._lib.check_error
   adbc_driver_manager.ProgrammingError: INVALID_ARGUMENT: [libpq] Failed to 
execute query: could not begin COPY: ERROR:  syntax error at or near "show"
   LINE 1: COPY (show all) TO STDOUT (FORMAT binary)
   ```


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