[11.x] feature/coalesce

[rmunate]

Hello devs,

I propose adding the COALESCE function to Laravel, which would be an excellent addition. COALESCE is a standard SQL tool widely used across different databases like Oracle, MySQL, and others. By integrating it into Laravel, it helps maintain clean and understandable code for developers familiar with standard SQL. Adding COALESCE to Laravel would enhance the development experience by adhering to recognized standards and simplifying the handling of null data in our queries.

$value = coalesce($var1, $var2, $var3, ....);