Adds optional Wheres attribute on class and method level

[ghost]

Regarding the discussion #29 I wrote down my idea of implementing where.

I added a new Attribute Where and made it available for class and method usage.

Usage:

#[Where('my-where', '[0-9]+')]
class MyController
{
    #[Get('my-get-route/{my-where}')]
    public function myGetMethod()
    {
    }

    #[Post('my-post-route/{my-where}/{my-alpha-numeric}')]
    #[WhereAlpha('alpha')]
    #[WhereAlphaNumeric('alpha-numeric')]
    #[WhereNumber('number')]
    #[WhereUuid('uuid')]
    public function myPostMethod()
    {
    }
}

We can improve this by implementing the shorthands laravel implemented either as own Attribute or as parameter for the Wheres attribute.
I'll leave this open for discussion.

Todo:

• Write docs
• Implement shorthands?

[freekmurze]

Thanks for your work on this.

[freekmurze]

Thanks!