LibWeb/CSS: Wrap calc()-resolution data in a struct

Initially I added this to the existing CalculationContext, but in
reality, we have some data at parse-time and different data at
resolve-time, so it made more sense to keep those separate.

Instead of needing a variety of methods for resolving a Foo, depending
on whether we have a Layout::Node available, or a percentage basis, or
a length resolution context... put those in a
CalculationResolutionContext, and just pass that one thing to these
methods. This also removes the need for separate resolve_*_percentage()
methods, because we can just pass the percentage basis in to the regular
resolve_foo() method.

This also corrects the issue that *any* calculation may need to resolve
lengths, but we previously only passed a length resolution context to
specific types in some situations. Now, they can all have one available,
though it's up to the caller to provide it.

Libraries/LibWeb/CSS/CSSStyleValue.cpp

@@ -386,7 +386,7 @@ int CSSStyleValue::to_font_weight() const
         return round_to<int>(as_number().number());
     }
     if (is_calculated()) {
-        auto maybe_weight = as_calculated().resolve_integer();
+        auto maybe_weight = as_calculated().resolve_integer({});
         if (maybe_weight.has_value())
             return maybe_weight.value();
     }