Add layer config access in legend

[hav142]

This PR is still drafted to fixes issue #793

How to test the feature:

• activate any layer
• check the icons on the legend

[wadhwamatic]

Nice work on this @hav142!

Can we have the legend box and the opacity / download interfaces the same width?

Some minor inputs from me which are just for consideration:

1. I think the icons can now be left aligned since they no longer are in-line with the layer name. What do you think?
2. A little more spacing between the legend detail text and the icons would be good to give some more room
3. I think we can space out the icons a bit too

[hav142]

@wadhwamatic Thanks for the suggestions. Is this good enough?

[wadhwamatic]

@hav142 - yes, that looks good. as you move forward with this, please have a look at #920 to make sure that the CSV download feature for exposure analysis works with your revised UI

[ericboucher]

@hav142 can you have a look at the linting issues? The demo endpoint will only get deployed if all the tests and linters are passing. Thanks!

[github-actions]

Build succeeded and deployed at https://prism-919.surge.sh
(hash f3eb9ad deployed at 2023-11-09T11:53:20)

[ericboucher]

Should we update the types too?

[wadhwamatic]

Thanks for picking this up again @echaidemenos. This works well except when I try to download a raster (WMS) layer. The download link works in the layer navigation, but not in the legend. See the error below from the legend download button:

@ericboucher - this sounds related to the issue we saw earlier today.

[wadhwamatic]

Looks good, thanks @echaidemenos !