Add support for single-argument cast functions

[zero-to-prod]

Description

• Fix ArgumentCountError when using built-in PHP functions (like strtolower) as cast callables
• Add reflection-based parameter count detection to pass appropriate number of arguments to cast functions

Before: Cast functions always received 4 arguments, causing built-in functions to fail:
ArgumentCountError: strtolower() expects exactly 1 argument, 4 given

After: Functions with 1 parameter receive only the value; others receive all 4 arguments:

#[Describe(['cast' => 'strtolower'])]
public string $name; // Now works