[5.6] Add filledAny method to Request

[timacdonald]

Currently to determine if the request has any filled values of a list of inputs, you do something like this:

if ($request->filled('disk') || $request->filled('site')) {
    //
}

This allows you to check if the request has filled values for any of the keys - similar to the existing hasAny.

if ($request->filledAny($filters)) {
    //
}

Although $request->filled($keys) accepts an array, it checks to determine if all the keys exist rather than any.

[JayBizzle]

FYI, previously proposed here #21388

[ntzm]

I think anyFilled is a better method name than filledAny, thoughts?