Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/core/html/canvas/WebGLContextAttributes.idl

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 [
+    NoInterfaceObject,
     Conditional=WEBGL,
 ] interface WebGLContextAttributes {
     attribute boolean alpha;
     attribute boolean depth;
     attribute boolean stencil;
     attribute boolean antialias;
     attribute boolean premultipliedAlpha;
     attribute boolean preserveDrawingBuffer;
 };