LibWeb: Add a whole bunch of HTML DOM bindings

Note that these aren't full implementations of the bindings. This
mostly implements the low hanging fruit (namely, basic reflections)

There are some attributes that should be USVString instead of
DOMString. However, USVString is a slightly different definition
of DOMString, so it should suffice for now.

Libraries/LibWeb/HTML/HTMLScriptElement.idl

@@ -0,0 +1,7 @@
+interface HTMLScriptElement : HTMLElement {
+
+    [Reflect] attribute DOMString src;
+    [Reflect] attribute DOMString type;
+    [Reflect] attribute DOMString integrity;
+
+}