bug#50500: Add ways to copy id bookmark link in eww

[Yuchen Pei]

Hello,

I'd like to add a functionality to copy the bookmark link to the 
kill ring when the point is on a element with an id attribute.

For example, say I am reading 
<http://www.gnu.org/licenses/gpl-3.0.html>, and Section 13 looks 
interesting which I want to save for reference.  By calling the 
said function while the point is at Section 13, the link 
<http://www.gnu.org/licenses/gpl-3.0.html#section13> is added to 
the kill ring.

I imagine it makes sense to bind it to w when the point is not on 
a link.

I took a look at eww.el and shr.el and I'm not sure where to start 
to add this functionality.  Does anyone have any pointers?

--
Best,
Yuchen

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