fix: improve column alias detection

[Seb33300]

Fixes #3235

This PR improves detection of column aliases.

Before, it could detect only if the alias has exactly 1 space between as and alias name.
Now it supports (I hope) all cases:

DB::raw('table.column as   alias'); // multiple spaces
DB::raw('table.column as `alias`'); // escaped (wrapped) aliases
DB::raw('table.column as alias, table.column2 as alias2'); // multiple aliases in 1 definition
// multiple lines
DB::raw('table.column as  
alias');

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[yajra]

Release on https://github.com/yajra/laravel-datatables/releases/tag/v12.2.0 🚀 Thanks!