Introduce WHEN() [V0.2]

[gin0115]

it woud be nice to introduce WHEN() as per Eloquent.

function when(bool $conditonal, Closure $true, ?Closure $false)

[gin0115]

Just IF

$builder
    ->table('foo')
    ->when($something === 'something', function($builder){
        $builder->orderBy('date');
    })->get();

IF/ELSE

$builder
    ->table('foo')
    ->when(
        $sortBy === 'date', 
        function($builder){
            $builder->orderBy('date');
        }),
        function($builder){
            $builder->orderBy('id');
        })
    )
    ->get();