refactor: improve error message for missing PHP DB extensions

[kenjis]

Description
Supersedes #9051
See #9158

$ php spark db:create report

CodeIgniter v4.5.4 Command Line Tool - Server Time: 2024-08-30 00:59:08 UTC+00:00

[CodeIgniter\Exceptions\CriticalError]
The required PHP extension "sqlsrv" is not loaded. Install and enable it to use "SQLSRV" driver.
at SYSTEMPATH/Database/Database.php:177

...

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

Do we need the assert here if the method throws by itself?

[kenjis]

My intention is not to slow down CI4 at all by executing the check every time in production environment.
When zend.assertions is -1, PHP does not generate code for assert().

First, this check (error message) is only for PHP beginners. Once the extension is enabled, the check will be not needed.
And this error often happens on development environments.
On shared hosting servers, they probably know what DBMS is supported, and PHP extensions for supported DBs are installed.