Add "Zoom to here" link in popup

[yhy0217]

Closes #778

• create shadowRoot for templated features and queries
• add functional "zoom to here" links in popups of inline-static / templated / queried features
• fix bugs in MapFeature, add tests for MapFeature.addEventListener
• add tests for zoomTo link

[prushforth]

@yhy0217 I put a build of this into GeoServer to test it against queryable layers, and I get the following on a query that should return a <map-feature> with a non-null <map-geometry>:

On the referenced line 401 of mapml.js,

 feature._extentEl.shadowRoot.firstChild?.remove();

the ._extentEl is null

The document returned by the query is:

-big, not relevant

[prushforth]

the ._extentEl is null

was mistaken, it's the shadowRoot property of ._extentEl that is null

[prushforth]

Closes #778

[prushforth]

This is really working well now - the custom projection query is even working on the shrink/swell layer - reveals a "Zoom to here" link that works - thanks for working on this, too, @AliyanH. Also, I noticed that the extension's "Zoom to here" link is working correctly now, for example when rendering a GeoServer WFS layer, the zoom to here link is correct. Overall, this is excellent work. I'll keep reviewing, but I think it's ready to merge.

[prushforth]

LGTM!

[prushforth]

Seems like the popup is hard to get rid of after clicking on the "Zoom to here" link, check the restaurants experiment.