LibWeb/WebGL: Move extensions into their own folder

Author: https://github.com/Lubrsi
Commit: de77a5e3ea
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3239
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/kalenikaliaksandr

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -4440,6 +4440,7 @@ using namespace Web::UserTiming;
 using namespace Web::WebAssembly;
 using namespace Web::WebAudio;
 using namespace Web::WebGL;
+using namespace Web::WebGL::Extensions;
 using namespace Web::WebIDL;
 using namespace Web::WebVTT;
 using namespace Web::XHR;