Add missing isPointInFill and isPointInStroke methods for SVGGeometryElement (web-sys idl update)

[amacgillivray]

Add missing isPointInFill and isPointInStroke methods to SVGGeometryElement idl.

Fixes #4507

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For the fix, I read the contributing guidelines regarding the web-sys package. Once I figured out how the interfaces are built from the IDLs, I found the SVGGeometryElement IDL on w3.org and added the missing interfaces. Then, I compiled using the instructions for adding new web-sys APIs.

The generated interfaces looked correct to me so I figured I'd go ahead and make a PR. Hope this helps. Let me know if this isn't quite correct!

[amacgillivray]

Re: failing checks, see:

• #4481
• #4482

[guybedford]

This just needs a changelog entry to land.