LibWeb/SVG: Implement SVGAnimated{Boolean,Enumerated,Integer} types

[jamierocks]

I was reading into the Filter effects specification, and realised these were missing.

Work towards GH-24168 and GH-23943.

[AtkinsSJ]

Thanks!

The spec actually specifies what steps to take when setting or getting the base/animated values, so it'd be good to implement those here, or at least put some FIXMEs in.

[jamierocks]

Looking into how these should be implemented properly with all the reflected values, etc - it might be best if these are implemented when <filter>/whatever uses them is done.